Start of a SGSAP (TS 29.118) dissector for LTE.

svn path=/trunk/; revision=35266

5 files changed, 1340 insertions, 90 deletions

diff --git a/epan/dissectors/Makefile.common b/epan/dissectors/Makefile.common
index 9f9a602b40..de763ee9a2 100644
--- a/epan/dissectors/Makefile.common
+++ b/epan/dissectors/Makefile.common
@@ -148,6 +148,7 @@ ASN1_DISSECTOR_SRC = \
 	packet-s1ap.c		\
 	packet-s4406.c \
 	packet-sabp.c \
+	packet-sgsap.c \
 	packet-smrse.c \
 	packet-spnego.c \
 	packet-sv.c \
diff --git a/epan/dissectors/packet-gsm_a_bssmap.c b/epan/dissectors/packet-gsm_a_bssmap.c
index 5b9a8fe019..eb50c3dd2e 100644
--- a/epan/dissectors/packet-gsm_a_bssmap.c
+++ b/epan/dissectors/packet-gsm_a_bssmap.c
@@ -61,6 +61,10 @@ const value_string gsm_a_bssmap_msg_strings[] = {
     { 0x01, "Assignment Request" },
     { 0x02, "Assignment Complete" },
     { 0x03, "Assignment Failure" },
+    { 0x04, "VGCS/VBS Setup" },
+    { 0x05, "VGCS/VBS Setup Ack" },
+    { 0x06, "VGCS/VBS Setup Refuse" },
+    { 0x07, "VGCS/VBS Assignment Request" },
     { 0x08, "Channel Modify request" },
     { 0x10, "Handover Request" },
     { 0x11, "Handover Required" },
@@ -85,6 +89,7 @@ const value_string gsm_a_bssmap_msg_strings[] = {
     { 0x24, "Reserved" },
     { 0x25, "SAPI 'n' Reject" },
     { 0x26, "Confusion" },
+    { 0x27, "Uplink Request Acknowledge" },
     { 0x28, "Suspend" },
     { 0x29, "Resume" },
     { 0x2a, "Connection Oriented Information" },
@@ -113,6 +118,11 @@ const value_string gsm_a_bssmap_msg_strings[] = {
     { 0x46, "Circuit Group Unblock" },
     { 0x47, "Circuit Group Unblocking Acknowledge" },
     { 0x48, "Unequipped Circuit" },
+    { 0x49, "Uplink Request Confirmation" },
+    { 0x4a, "Uplink Release Indication" },
+    { 0x4b, "Uplink Reject Command" },
+    { 0x4c, "Uplink Release Command" },
+    { 0x4d, "Uplink Seized Command" },
     { 0x4e, "Change Circuit" },
     { 0x4f, "Change Circuit Acknowledge" },
     { 0x50, "Resource Request" },
@@ -126,20 +136,10 @@ const value_string gsm_a_bssmap_msg_strings[] = {
     { 0x58, "Classmark Request" },
     { 0x59, "Cipher Mode Reject" },
     { 0x5a, "Load Indication" },
-    { 0x04, "VGCS/VBS Setup" },
-    { 0x05, "VGCS/VBS Setup Ack" },
-    { 0x06, "VGCS/VBS Setup Refuse" },
-    { 0x07, "VGCS/VBS Assignment Request" },
     { 0x1c, "VGCS/VBS Assignment Result" },
     { 0x1d, "VGCS/VBS Assignment Failure" },
     { 0x1e, "VGCS/VBS Queuing Indication" },
     { 0x1f, "Uplink Request" },
-    { 0x27, "Uplink Request Acknowledge" },
-    { 0x49, "Uplink Request Confirmation" },
-    { 0x4a, "Uplink Release Indication" },
-    { 0x4b, "Uplink Reject Command" },
-    { 0x4c, "Uplink Release Command" },
-    { 0x4d, "Uplink Seized Command" },
     { 0x50, "VGCS Additional Information" },
     { 0x51, "VGCS SMS" },
     { 0x52, "Notification Data" },
@@ -6127,92 +6127,92 @@ bssmap_reset_res_ack(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
 static gint ett_gsm_bssmap_msg[NUM_GSM_BSSMAP_MSG];
 
 static void (*bssmap_msg_fcn[])(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len) = {
-    bssmap_ass_req, /* Assignment Request */
-    bssmap_ass_complete,    /* Assignment Complete */
-    bssmap_ass_failure, /* Assignment Failure */
-    bssmap_chan_mod_req,            /* Channel Modify request */
-    bssmap_ho_req,  /* Handover Request */
-    bssmap_ho_reqd, /* Handover Required */
-    bssmap_ho_req_ack,  /* Handover Request Acknowledge */
-    bssmap_ho_cmd,  /* Handover Command */
-    bssmap_ho_complete, /* Handover Complete */
-    bssmap_ho_succ ,    /* Handover Succeeded */
-    bssmap_ho_failure,  /* Handover Failure */
-    bssmap_ho_performed,    /* Handover Performed */
-    bssmap_ho_cand_enq, /* Handover Candidate Enquire */
-    bssmap_ho_cand_resp,    /* Handover Candidate Response */
-    bssmap_ho_reqd_rej, /* Handover Required Reject */
-    bssmap_ho_det,  /* Handover Detect */
-    bssmap_int_ho_req,  /* Internal Handover Required */
-    bssmap_int_ho_req_rej,  /* Internal Handover Required Reject */
-    bssmap_int_ho_cmd,  /* Internal Handover Command */
-    bssmap_int_ho_enq,  /* Internal Handover Enquiry */
-    bssmap_clear_cmd,   /* Clear Command */
+    bssmap_ass_req,				/* Assignment Request */
+    bssmap_ass_complete,		/* Assignment Complete */
+    bssmap_ass_failure,			/* Assignment Failure */
+    bssmap_vgcs_vbs_setup,		/* VGCS/VBS Setup */
+    bssmap_vgcs_vbs_setup_ack,  /* VGCS/VBS Setup Ack */
+    bssmap_vgcs_vbs_setup_refuse,   /* VGCS/VBS Setup Refuse */
+    bssmap_vgcs_vbs_ass_req,    /* VGCS/VBS Assignment Request */
+    bssmap_chan_mod_req,        /* Channel Modify request */
+    bssmap_ho_req,				/* Handover Request */
+    bssmap_ho_reqd,				/* Handover Required */
+    bssmap_ho_req_ack,			/* Handover Request Acknowledge */
+    bssmap_ho_cmd,				/* Handover Command */
+    bssmap_ho_complete,			/* Handover Complete */
+    bssmap_ho_succ ,			/* Handover Succeeded */
+    bssmap_ho_failure,			/* Handover Failure */
+    bssmap_ho_performed,		/* Handover Performed */
+    bssmap_ho_cand_enq,			/* Handover Candidate Enquire */
+    bssmap_ho_cand_resp,		/* Handover Candidate Response */
+    bssmap_ho_reqd_rej,			/* Handover Required Reject */
+    bssmap_ho_det,				/* Handover Detect */
+    bssmap_int_ho_req,			/* Internal Handover Required */
+    bssmap_int_ho_req_rej,		/* Internal Handover Required Reject */
+    bssmap_int_ho_cmd,			/* Internal Handover Command */
+    bssmap_int_ho_enq,			/* Internal Handover Enquiry */
+    bssmap_clear_cmd,			/* Clear Command */
     NULL /* no associated data */,  /* Clear Complete */
-    bssmap_clear_req,   /* Clear Request */
-    NULL,   /* Reserved */
-    NULL,   /* Reserved */
-    bssmap_sapi_rej,    /* SAPI 'n' Reject */
-    bssmap_confusion,   /* Confusion */
-    bssmap_sus, /* Suspend */
-    bssmap_res, /* Resume */
-    bssmap_conn_oriented,   /* Connection Oriented Information */
-    bssmap_perf_loc_req,    /* Perform Location Request */
-    bssmap_lsa_info,    /* LSA Information */
-    bssmap_perf_loc_res,    /* Perform Location Response */
-    bssmap_perf_loc_abort,  /* Perform Location Abort */
-    bssmap_common_id,   /* Common Id */
-    bssmap_reset,   /* Reset */
+    bssmap_clear_req,			/* Clear Request */
+    NULL,						/* Reserved */
+    NULL,						/* Reserved */
+    bssmap_sapi_rej,			/* SAPI 'n' Reject */
+    bssmap_confusion,			/* Confusion */
+    bssmap_uplink_req_ack,		/* Uplink Request Acknowledge */
+    bssmap_sus,					/* Suspend */
+    bssmap_res,					/* Resume */
+    bssmap_conn_oriented,		/* Connection Oriented Information */
+    bssmap_perf_loc_req,		/* Perform Location Request */
+    bssmap_lsa_info,			/* LSA Information */
+    bssmap_perf_loc_res,		/* Perform Location Response */
+    bssmap_perf_loc_abort,		/* Perform Location Abort */
+    bssmap_common_id,			/* Common Id */
+    bssmap_reset,				/* Reset */
     NULL /* no associated data */,  /* Reset Acknowledge */
-    bssmap_overload,    /* Overload */
-    NULL,   /* Reserved */
-    bssmap_reset_cct,   /* Reset Circuit */
-    bssmap_reset_cct_ack,   /* Reset Circuit Acknowledge */
+    bssmap_overload,			/* Overload */
+    NULL,						/* Reserved */
+    bssmap_reset_cct,			/* Reset Circuit */
+    bssmap_reset_cct_ack,		/* Reset Circuit Acknowledge */
     bssmap_msc_invoke_trace,    /* MSC Invoke Trace */
     bssmap_bss_invoke_trace,    /* BSS Invoke Trace */
-    NULL,   /* Connectionless Information */
-    bssmap_reset_res,   /* Reset Resource */
-    bssmap_reset_res_ack,   /* Reset Resource Acknowledge */
-    bssmap_block,   /* Block */
-    bssmap_block_ack,   /* Blocking Acknowledge */
-    bssmap_unblock, /* Unblock */
-    bssmap_unblock_ack, /* Unblocking Acknowledge */
-    bssmap_cct_group_block, /* Circuit Group Block */
+    NULL,						/* Connectionless Information */
+    bssmap_reset_res,			/* Reset Resource */
+    bssmap_reset_res_ack,		/* Reset Resource Acknowledge */
+    bssmap_block,				/* Block */
+    bssmap_block_ack,			/* Blocking Acknowledge */
+    bssmap_unblock,				/* Unblock */
+    bssmap_unblock_ack,			/* Unblocking Acknowledge */
+    bssmap_cct_group_block,		/* Circuit Group Block */
     bssmap_cct_group_block_ack, /* Circuit Group Blocking Acknowledge */
     bssmap_cct_group_unblock,   /* Circuit Group Unblock */
     bssmap_cct_group_unblock_ack,   /* Circuit Group Unblocking Acknowledge */
-    bssmap_unequipped_cct,  /* Unequipped Circuit */
-    bssmap_change_cct,  /* Change Circuit */
-    bssmap_change_cct_ack,  /* Change Circuit Acknowledge */
-    bssmap_res_req, /* Resource Request */
-    bssmap_res_ind, /* Resource Indication */
-    bssmap_paging,  /* Paging */
-    bssmap_ciph_mode_cmd,   /* Cipher Mode Command */
-    bssmap_cm_upd,  /* Classmark Update */
+    bssmap_unequipped_cct,		/* Unequipped Circuit */
+    bssmap_uplink_req_conf,		/* Uplink Request Confirmation */
+    bssmap_uplink_rel_ind,		/* Uplink Release Indication */
+    bssmap_uplink_rej_cmd,		/* Uplink Reject Command */
+    bssmap_uplink_rel_cmd,		/* Uplink Release Command */
+    bssmap_uplink_seized_cmd,   /* Uplink Seized Command */
+    bssmap_change_cct,			/* Change Circuit */
+    bssmap_change_cct_ack,		/* Change Circuit Acknowledge */
+    bssmap_res_req,				/* Resource Request */
+    bssmap_res_ind,				/* Resource Indication */
+    bssmap_paging,				/* Paging */
+    bssmap_ciph_mode_cmd,		/* Cipher Mode Command */
+    bssmap_cm_upd,				/* Classmark Update */
     bssmap_ciph_mode_complete,  /* Cipher Mode Complete */
     NULL /* no associated data */,  /* Queuing Indication */
-    bssmap_cl3_info,    /* Complete Layer 3 Information */
+    bssmap_cl3_info,			/* Complete Layer 3 Information */
     bssmap_cls_m_req /* no associated data */,  /* Classmark Request */
-    bssmap_ciph_mode_rej,   /* Cipher Mode Reject */
-    bssmap_load_ind,    /* Load Indication */
-    bssmap_vgcs_vbs_setup,  /* VGCS/VBS Setup */
-    bssmap_vgcs_vbs_setup_ack,  /* VGCS/VBS Setup Ack */
-    bssmap_vgcs_vbs_setup_refuse,   /* VGCS/VBS Setup Refuse */
-    bssmap_vgcs_vbs_ass_req,    /* VGCS/VBS Assignment Request */
+    bssmap_ciph_mode_rej,		/* Cipher Mode Reject */
+    bssmap_load_ind,			/* Load Indication */
     bssmap_vgcs_vbs_ass_res,    /* VGCS/VBS Assignment Result */
     bssmap_vgcs_vbs_ass_fail,   /* VGCS/VBS Assignment Failure */
-    NULL,   /* No dsta VGCS/VBS Queuing Indication */
-    bssmap_uplink_req,  /* Uplink Request */
-    bssmap_uplink_req_ack,  /* Uplink Request Acknowledge */
-    bssmap_uplink_req_conf, /* Uplink Request Confirmation */
-    bssmap_uplink_rel_ind,  /* Uplink Release Indication */
-    bssmap_uplink_rej_cmd,  /* Uplink Reject Command */
-    bssmap_uplink_rel_cmd,  /* Uplink Release Command */
-    bssmap_uplink_seized_cmd,   /* Uplink Seized Command */
-    bssmap_vgcs_add_inf,    /* VGCS Additional Information */
-    bssmap_vgcs_sms,    /* VGCS SMS */
+    NULL,						/* No dsta VGCS/VBS Queuing Indication */
+    bssmap_uplink_req,			/* Uplink Request */
+    bssmap_vgcs_add_inf,		/* VGCS Additional Information */
+    bssmap_vgcs_sms,			/* VGCS SMS */
     bssmap_notification_data,   /* Notification Data*/
-    bssmap_uplink_app_data, /* Uplink Application Data */
+    bssmap_uplink_app_data,		/* Uplink Application Data */
     NULL,   /* NONE */
 };
 
diff --git a/epan/dissectors/packet-gsm_a_common.c b/epan/dissectors/packet-gsm_a_common.c
index d94f654c13..068b91cd5b 100644
--- a/epan/dissectors/packet-gsm_a_common.c
+++ b/epan/dissectors/packet-gsm_a_common.c
@@ -942,6 +942,9 @@ const char* get_gsm_a_msg_string(int pdu_type, int idx)
 	case NAS_PDU_TYPE_ESM:
 		msg_string = nas_esm_elem_strings[idx].strptr;
 		break;
+	case SGSAP_PDU_TYPE:
+		msg_string = sgsap_elem_strings[idx].strptr;
+		break;
 	default:
 		DISSECTOR_ASSERT_NOT_REACHED();
 	}
@@ -987,6 +990,9 @@ static int get_hf_elem_id(int pdu_type)
 	case NAS_PDU_TYPE_ESM:
 		hf_elem_id = hf_nas_eps_esm_elem_id;
 		break;
+	case SGSAP_PDU_TYPE:
+		hf_elem_id = hf_sgsap_elem_id;
+		break;
 	default:
 		DISSECTOR_ASSERT_NOT_REACHED();
 	}
diff --git a/epan/dissectors/packet-gsm_a_common.h b/epan/dissectors/packet-gsm_a_common.h
index d8bb0de7ff..1a4cdf6380 100644
--- a/epan/dissectors/packet-gsm_a_common.h
+++ b/epan/dissectors/packet-gsm_a_common.h
@@ -140,6 +140,11 @@ extern gint ett_nas_eps_esm_elem[];
 extern elem_fcn esm_elem_fcn[];
 extern int hf_nas_eps_esm_elem_id;
 
+extern const value_string sgsap_elem_strings[];
+extern gint ett_sgsap_elem[];
+extern elem_fcn sgsap_elem_fcn[];
+extern int hf_sgsap_elem_id;
+
 extern sccp_msg_info_t* sccp_msg;
 extern sccp_assoc_info_t* sccp_assoc;
 
@@ -167,17 +172,18 @@ extern int hf_gsm_a_lac;
 
 /* flags for the packet-gsm_a_common routines */
 #define GSM_A_PDU_TYPE_BSSMAP		0  /* BSSAP_PDU_TYPE_BSSMAP i.e. 0 - until split complete at least! */
-#define GSM_A_PDU_TYPE_DTAP		1  /* BSSAP_PDU_TYPE_DTAP i.e. 1   - until split complete at least! */
-#define GSM_A_PDU_TYPE_RP		2
-#define GSM_A_PDU_TYPE_RR		3
+#define GSM_A_PDU_TYPE_DTAP			1  /* BSSAP_PDU_TYPE_DTAP i.e. 1   - until split complete at least! */
+#define GSM_A_PDU_TYPE_RP			2
+#define GSM_A_PDU_TYPE_RR			3
 #define GSM_A_PDU_TYPE_COMMON		4
-#define GSM_A_PDU_TYPE_GM		5
+#define GSM_A_PDU_TYPE_GM			5
 #define GSM_A_PDU_TYPE_BSSLAP		6
 #define GSM_A_PDU_TYPE_SACCH		7
 #define GSM_PDU_TYPE_BSSMAP_LE		8
-#define NAS_PDU_TYPE_COMMON		9
-#define NAS_PDU_TYPE_EMM		10
-#define NAS_PDU_TYPE_ESM		11
+#define NAS_PDU_TYPE_COMMON			9
+#define NAS_PDU_TYPE_EMM			10
+#define NAS_PDU_TYPE_ESM			11
+#define SGSAP_PDU_TYPE				12
 
 extern const char* get_gsm_a_msg_string(int pdu_type, int idx);
 
@@ -287,6 +293,11 @@ extern const char* get_gsm_a_msg_string(int pdu_type, int idx);
 		SEV_elem_ett = ett_nas_eps_esm_elem; \
 		SEV_elem_funcs = esm_elem_fcn; \
 		break; \
+	case SGSAP_PDU_TYPE: \
+		SEV_elem_names = sgsap_elem_strings; \
+		SEV_elem_ett = ett_sgsap_elem; \
+		SEV_elem_funcs = sgsap_elem_fcn; \
+		break; \
 	default: \
 		proto_tree_add_text(tree, \
 			tvb, curr_offset, -1, \
diff --git a/epan/dissectors/packet-sgsap.c b/epan/dissectors/packet-sgsap.c
new file mode 100644
index 0000000000..265a3727da
--- /dev/null
+++ b/epan/dissectors/packet-sgsap.c
@@ -0,0 +1,1232 @@
+/* packet-sgsap.c
+ * Routines for SGs Application Part (SGsAP) protocol dissection
+ *
+ * Copyright 2010, Anders Broman <anders.broman@ericsson.com>
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * References: 3GPP TS 29.118 V10.2.0 (2010-12)
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/asn1.h>
+
+#include "packet-gsm_a_common.h"
+
+#define PNAME  "SGs Application Part (SGsAP)"
+#define PSNAME "SGSAP"
+#define PFNAME "sgsap"
+
+/* The registered SCTP port number for SGsAP is 29118.
+ * The payload protocol identifier to be used for SGsAP is 0.
+ */
+#define SCTP_PORT_SGSAP	29118
+
+
+/* Global variables */
+static guint gbl_sgsapSctpPort=SCTP_PORT_SGSAP;
+
+
+/* Initialize the protocol and registered fields */
+static int proto_sgsap = -1;
+
+static int hf_sgsap_msg_type = -1;
+int hf_sgsap_elem_id = -1;
+static int hf_sgsap_eps_location_update_type = -1;
+static int hf_sgsap_service_indicator_value = -1;
+static int hf_sgsap_sgs_cause = -1;
+
+static int ett_sgsap = -1;
+
+/* 
+ * 9.4	Information elements
+ */
+/*
+ * 9.4.1	CLI
+ */
+
+/*
+ * Octets 3 to 14 contain the value part of the Calling party BCD number information element 
+ * defined in subclause 10.5.4.9 of 3GPP TS 24.008 [8] (octets 3 to 14, i.e. not including 
+ * 3GPP TS 24.008 IEI and 3GPP TS 24.008 length indicator) 
+ * ( packet-gsm_a_dtap.c )
+ */
+/*
+ * 9.4.2	EPS location update type
+ */
+
+/* EPS location update type value (octet 3) */
+static const value_string sgsap_eps_location_update_type_values[] = {
+	{ 0x00,	"Shall not be sent in this version of the protocol" },
+	{ 0x01,	"IMSI attach" },
+	{ 0x02,	"Normal location update" },
+	{ 0, NULL }
+};
+
+static guint16
+de_sgsap_eps_loc_upd_type(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+{
+	guint32	curr_offset;
+
+	curr_offset = offset;
+
+	/* Octet 3	EPS location update type value */
+	proto_tree_add_item(tree, hf_sgsap_eps_location_update_type, tvb, offset, 1, FALSE);
+	curr_offset++;
+
+	return(curr_offset - offset);
+}
+/*
+ * 9.4.3	Erroneous message
+ *
+ * See subclause 18.4.5 in 3GPP TS 29.018 [16].
+ */
+static guint16
+de_sgsap_err_msg(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+{
+	guint32	curr_offset;
+
+	curr_offset = offset;
+
+	proto_tree_add_text(tree, tvb, curr_offset, len, "IE data not dissected yet");
+
+	return(len);
+}
+/*
+ * 9.4.3a	E-UTRAN Cell Global Identity
+ *
+ * The coding of the E-UTRAN Cell Global Identity value is according to ECGI field information element
+ * as specified in subclause 8.21.5 of 3GPP TS 29.274 [17A]
+ */
+/*
+ * 9.4.4	Global CN-Id
+ *
+ * See subclause 18.4.27 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.5	IMEISV
+ * See subclause 18.4.9 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.6	IMSI
+ * See subclause 18.4.10 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.7	IMSI detach from EPS service type
+ */
+/*
+ * 9.4.8	IMSI detach from non-EPS service type
+ */
+/*
+ * 9.4.9	LCS client identity
+ */
+/*
+ * 9.4.10	LCS indicator
+ */
+/*
+ * 9.4.11	Location area identifier
+ *
+ * Octets 3 to 7 contain the value part of the Location area identification information element
+ * defined in 3GPP TS 24.008 [8] (starting with octet 2, i.e. not including 3GPP TS 24.008 IEI)
+ */
+/*
+ * 9.4.12	MM information
+ */
+/*
+ * 9.4.13	MME name
+ */
+static guint16
+de_sgsap_mme_name(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+{
+	guint32	curr_offset;
+
+	curr_offset = offset;
+
+	proto_tree_add_text(tree, tvb, curr_offset, len, "IE data not dissected yet");
+
+	return(len);
+}
+/*
+ * 9.4.14	Mobile identity
+ * See subclause 18.4.17 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.14a	Mobile Station Classmark 2
+ * With the exception of the IEI, the contents are specified in subclause 10.5.1.6 in 3GPP TS 24.008 [8].
+ */
+/*
+ * 9.4.15	NAS message container
+ * Octets 3 to 253 contain the SMS message (i.e. CP DATA, CP ACK or CP ERROR) as defined in subclause 7.2 of 3GPP TS 24.011 [10]
+ */
+/*
+ * 9.4.16	Reject cause
+ * See subclause 18.4.21 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.17	Service indicator
+ */
+
+/* Octet 3	Service indicator value */
+static const value_string sgsap_service_indicator_values[] = {
+	{ 0x00,	"Shall not be sent in this version of the protocol" },
+	{ 0x01,	"CS call indicator" },
+	{ 0x02,	"SMS indicator" },
+	{ 0, NULL }
+};
+
+static guint16
+de_sgsap_serv_indic(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+{
+	guint32	curr_offset;
+
+	curr_offset = offset;
+
+	/* Octet 3	Service indicator value */
+	proto_tree_add_item(tree, hf_sgsap_service_indicator_value, tvb, offset, 1, FALSE);
+	curr_offset++;
+
+	return(curr_offset - offset);
+}
+/*
+ * 9.4.18	SGs cause
+ */
+
+/* SGs cause value (octet 3) */
+static const value_string sgsap_sgs_cause_values[] = {
+	{ 0x00,	"Normal, unspecified in this version of the protocol" },
+	{ 0x01,	"IMSI detached for EPS services" },
+	{ 0x02,	"IMSI detached for EPS and non-EPS services" },
+	{ 0x03,	"IMSI unknown" },
+	{ 0x04,	"IMSI detached for non-EPS services" },
+	{ 0x05,	"IMSI implicitly detached for non-EPS services" },
+	{ 0x06,	"UE unreachable" },
+	{ 0x07,	"Message not compatible with the protocol state" },
+	{ 0x08,	"Missing mandatory information element" },
+	{ 0x09,	"Invalid mandatory information" },
+	{ 0x0a,	"Conditional information element error" },
+	{ 0x0b,	"Semantically incorrect message" },
+	{ 0x0c,	"Message unknown" },
+	{ 0x0d,	"Mobile terminating CS fallback call rejected by the user" },
+	{ 0, NULL }
+};
+
+static guint16
+de_sgsap_sgs_cause(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+{
+	guint32	curr_offset;
+
+	curr_offset = offset;
+
+	/* Octet 3	Service indicator value */
+	proto_tree_add_item(tree, hf_sgsap_sgs_cause, tvb, offset, 1, FALSE);
+	curr_offset++;
+
+	return(curr_offset - offset);
+}
+/*
+ * 9.4.19	SS code
+ * The coding of the SS code value is according to SS-Code as specified in subclause 17.7.5 of 3GPP TS 29.002 [15]
+ */
+/*
+ * 9.4.20	TMSI
+ * See subclause 18.4.23 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.21	TMSI status
+ *
+ * See subclause 18.4.24 in 3GPP TS 29.018 [16].
+ */
+/*
+ * 9.4.21a	Tracking Area Identity
+ * Octets 3 to 7 contain the value part of the Tracking Area Identity information element defined in 3GPP TS 24.301 [14]
+ * (starting with octet 2, i.e. not including 3GPP TS 24.301 IEI)
+ */
+/*
+ * 9.4.21b	UE Time Zone
+ * The coding of the UE Time Zone value is according to value part of the Time Zone information element as specified
+ * in subclause 10.5.3.8 of 3GPP TS 24.008 [8] (i.e. not including 3GPP TS 24.008 IEI)
+ */
+/*
+ * 9.4.21c	UE EMM mode
+ */
+/*
+ * 9.4.22	VLR name
+ */
+static guint16
+de_sgsap_vlr_name(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+{
+	guint32	curr_offset;
+
+	curr_offset = offset;
+	/* The VLR name information element specifies the VLR name and is coded as shown in figure 9.4.22.1. 
+	 * Octets 3 through n contain the VLR name in the form of a fully qualified domain name (FQDN) 
+	 * as specified in IETF RFC 1035 [21]. 
+	 */
+	proto_tree_add_text(tree, tvb, curr_offset, len, "IE data not dissected yet");
+
+	return(len);
+}
+
+/*
+ * 9.4.23	Channel needed
+ */
+/*
+ * 9.4.24	eMLPP priority
+ */
+
+const value_string sgsap_elem_strings[] = {
+	{ 0x01,	"IMSI" },									/* 9.4.6 */
+	{ 0x02,	"VLR name" },								/* 9.4.22 */
+	{ 0x03,	"TMSI" },									/* 9.4.20 */
+	{ 0x04,	"Location area identifier" },				/* 9.4.11 */
+	{ 0x05,	"Channel Needed" },							/* 9.4.23 */
+	{ 0x06,	"eMLPP Priority" },							/* 9.4.24 */
+	{ 0x07,	"TMSI status" },							/* 9.4.21 */
+	{ 0x08,	"SGs cause" },								/* 9.4.18 */
+	{ 0x09,	"MME name" },								/* 9.4.13 */
+	{ 0x0a,	"EPS location update type" },				/* 9.4.2 */
+	{ 0x0b,	"Global CN-Id" },							/* 9.4.4 */
+
+	{ 0x0c,	"Undefined" },								/*  */
+	{ 0x0d,	"Undefined" },								/*  */
+
+	{ 0x0e,	"Mobile identity" },						/* 9.4.14 */
+	{ 0x0f,	"Reject cause" },							/* 9.4.16 */
+	{ 0x10,	"IMSI detach from EPS service type" },		/* 9.4.7 */
+	{ 0x11,	"IMSI detach from non-EPS service type" },	/* 9.4.8 */
+
+	{ 0x15,	"IMEISV" },									/* 9.4.5 */
+	{ 0x16,	"NAS message container" },					/* 9.4.15 */
+	{ 0x17,	"MM information" },							/* 9.4.12 */
+
+	{ 0x18,	"Undefined" },								/*  */
+	{ 0x19,	"Undefined" },								/*  */
+	{ 0x1a,	"Undefined" },								/*  */
+
+	{ 0x1b,	"Erroneous message" },						/* 9.4.3 */
+	{ 0x1c,	"CLI" },									/* 9.4.1 */
+	{ 0x1d,	"LCS client identity" },					/* 9.4.9 */
+	{ 0x1e, "LCS indicator" },							/* 9.4.10 */
+	{ 0x1f, "SS code" },								/* 9.4.19 */
+	{ 0x20, "Service indicator" },						/* 9.4.17 */
+	{ 0x21, "UE Time Zone" },							/* 9.4.21b */
+	{ 0x22, "Mobile Station Classmark 2" },				/* 9.4.14a */
+	{ 0x23, "Tracking Area Identity" },					/* 9.4.21a */
+	{ 0x24, "E-UTRAN Cell Global Identity" },			/* 9.4.3a */
+	{ 0x25, "UE EMM mode" },							/* 9.4.21c */
+
+	{ 0, NULL }
+};
+
+#define	NUM_SGSAP_ELEM (sizeof(sgsap_elem_strings)/sizeof(value_string))
+gint ett_sgsap_elem[NUM_SGSAP_ELEM];
+
+typedef enum
+{
+
+	DE_SGSAP_IMSI,									/* 9.4.6 IMSI*/
+	DE_SGSAP_VLR_NAME,								/* 9.4.22 VLR name*/
+	DE_SGSAP_TMSI,									/* 9.4.20 TMSI */
+	DE_SGSAP_LOC_AREA_ID,							/* 9.4.11 Location area identifier */
+	DE_SGSAP_CH_NEEDED,								/* 9.4.23 Channel Needed */
+	DE_SGSAP_EMLPP_PRIO,							/* 9.4.24 eMLPP Priority*/
+	DE_SGSAP_TMSI_STATUS,							/* 9.4.21 TMSI status */
+	DE_SGSAP_SGS_CAUSE,								/* 9.4.18 SGs cause*/
+	DE_SGSAP_MME_NAME,								/* 9.4.13 MME name*/
+	DE_SGSAP_EPS_LOC_UPD_TYPE,						/* 9.4.2 EPS location update type*/
+	DE_SGSAP_GLOBAL_CN_ID,							/* 9.4.4 Global CN-Id*/
+
+	DE_SGSAP_UDEF_12,								/* Undefined */
+	DE_SGSAP_UDEF_13,								/* Undefined */
+
+	DE_SGSAP_MID,									/* 9.4.14 Mobile identity*/
+	DE_SGSAP_REJ_CAUSE,								/* 9.4.16 Reject cause */
+	DE_SGSAP_IMSI_DET_EPS,							/* 9.4.7 IMSI detach from EPS service type */
+	DE_SGSAP_IMSI_DET_NON_EPS,						/* 9.4.8 IMSI detach from non-EPS service type */
+
+	DE_SGSAP_IMEISV,								/* 9.4.5 IMEISV */
+	DE_SGSAP_NAS_MSG_CONTAINER,						/* 9.4.15 NAS message container*/
+	DE_SGSAP_MM_INFO,								/* 9.4.12 MM information*/
+
+	DE_SGSAP_UDEF_24,								/* Undefined */
+	DE_SGSAP_UDEF_25,								/* Undefined */
+	DE_SGSAP_UDEF_26,								/* Undefined */
+
+	DE_SGSAP_ERR_MSG,								/* 9.4.3 Erroneous message*/
+	DE_SGSAP_CLI,									/* 9.4.1 CLI */
+	DE_SGSAP_LCS_CLIENT_ID,							/* 9.4.9 LCS client identity */
+	DE_SGSAP_LCS_INDIC,								/* 9.4.10 LCS indicator */
+	DE_SGSAP_SS_CODE,								/* 9.4.19 SS code */
+	DE_SGSAP_SERV_INDIC,							/* 9.4.17 Service indicator */
+	DE_SGSAP_UE_TZ,									/* 9.4.21b UE Time Zone */
+	DE_SGSAP_MSC_2,									/* 9.4.14a Mobile Station Classmark 2 */
+	DE_SGSAP_TAID,									/* 9.4.21a Tracking Area Identity */
+	DE_SGSAP_E_UTRAN_CGI,							/* 9.4.3a E-UTRAN Cell Global Identity */
+	DE_SGSAP_UE_EMM_MODE,							/* 9.4.21c UE EMM mode*/
+
+	DE_SGAP_NONE							/* NONE */
+}
+sgsap_elem_idx_t;
+
+guint16 (*sgsap_elem_fcn[])(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len, gchar *add_string, int string_len) = {
+	NULL/*DE_SGSAP_IMSI*/,									/* 9.4.6 IMSI*/
+	de_sgsap_vlr_name,										/* 9.4.22 VLR name*/
+	NULL/*DE_SGSAP_TMSI*/,									/* 9.4.20 TMSI */
+	NULL/*DE_SGSAP_LOC_AREA_ID*/,							/* 9.4.11 Location area identifier */
+	NULL/*DE_SGSAP_CH_NEEDED*/,								/* 9.4.23 Channel Needed */
+	NULL/*DE_SGSAP_EMLPP_PRIO*/,							/* 9.4.24 eMLPP Priority*/
+	NULL/*DE_SGSAP_TMSI_STATUS*/,							/* 9.4.21 TMSI status */
+	de_sgsap_sgs_cause,										/* 9.4.18 SGs cause*/
+	de_sgsap_mme_name,										/* 9.4.13 MME name*/
+	de_sgsap_eps_loc_upd_type,								/* 9.4.2 EPS location update type*/
+	NULL/*DE_SGSAP_GLOBAL_CN-ID*/,							/* 9.4.4 Global CN-Id*/
+
+	NULL/*DE_SGSAP_UDEF_12*/,								/* Undefined */
+	NULL/*DE_SGSAP_UDEF_13*/,								/* Undefined */
+
+	NULL/*DE_SGSAP_MID*/,									/* 9.4.14 Mobile identity*/
+	NULL/*DE_SGSAP_REJ_CAUSE*/,								/* 9.4.16 Reject cause */
+	NULL/*DE_SGSAP_IMSI_DET_EPS*/,							/* 9.4.7 IMSI detach from EPS service type */
+	NULL/*DE_SGSAP_IMSI_DET_NON_EPS*/,						/* 9.4.8 IMSI detach from non-EPS service type */
+
+	NULL/*DE_SGSAP_IMEISV*/,								/* 9.4.5 IMEISV */
+	NULL/*DE_SGSAP_NAS_MSG_CONTAINER*/,						/* 9.4.15 NAS message container*/
+	NULL/*DE_SGSAP_MM_INFO*/,								/* 9.4.12 MM information*/
+
+	NULL/*DE_SGSAP_UDEF_24*/,								/* Undefined */
+	NULL/*DE_SGSAP_UDEF_25*/,								/* Undefined */
+	NULL/*DE_SGSAP_UDEF_26*/,								/* Undefined */
+
+	de_sgsap_err_msg,										/* 9.4.3 Erroneous message*/
+	NULL/*DE_SGSAP_CLI*/,									/* 9.4.1 CLI */
+	NULL/*DE_SGSAP_LCS_CLIENT_ID*/,							/* 9.4.9 LCS client identity */
+	NULL/*DE_SGSAP_LCS_INDIC*/,								/* 9.4.10 LCS indicator */
+	NULL/*DE_SGSAP_SS_CODE*/,								/* 9.4.19 SS code */
+	de_sgsap_serv_indic,									/* 9.4.17 Service indicator */
+	NULL/*DE_SGSAP_UE_TZ*/,									/* 9.4.21b UE Time Zone */
+	NULL/*DE_SGSAP_MSC_2*/,									/* 9.4.14a Mobile Station Classmark 2 */
+	NULL/*DE_SGSAP_TAID*/,									/* 9.4.21a Tracking Area Identity */
+	NULL/*DE_SGSAP_E_UTRAN_CGI*/,							/* 9.4.3a E-UTRAN Cell Global Identity */
+	NULL/*DE_SGSAP_UE_EMM_MODE*/,							/* 9.4.21c UE EMM mode*/
+
+	NULL,	/* NONE */
+};
+
+/* MESSAGE FUNCTIONS */
+
+/*
+ * 8.1	SGsAP-ALERT-ACK message
+ */
+static void
+sgsap_alert_ack(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.2	SGsAP-ALERT-REJECT message
+ */
+static void
+sgsap_alert_rej(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* SGs Cause	SGs cause  9.4.18	M	TLV	3 */ 
+	ELEM_MAND_TLV(0x08, SGSAP_PDU_TYPE, DE_SGSAP_SGS_CAUSE, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.3	SGsAP-ALERT-REQUEST message
+ */
+static void
+sgsap_alert_req(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.4	SGsAP-DOWNLINK-UNITDATA message
+ */
+static void
+sgsap_dl_unitdata(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* NAS message container	NAS message container 9.4.15	M	TLV	4-253 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.5	SGsAP-EPS-DETACH-ACK message
+ */
+
+static void
+sgsap_eps_det_ack(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.6	SGsAP-EPS-DETACH-INDICATION message
+ */
+
+static void
+sgsap_eps_det_ind(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* MME name	MME name 9.4.13	M	TLV	57 */
+	/* IMSI detach from EPS service type	IMSI detach from EPS service type 9.4.7	M	TLV	3 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.7	SGsAP-IMSI-DETACH-ACK message
+ */
+static void
+sgsap_imsi_det_ack(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.8	SGsAP-IMSI-DETACH-INDICATION message
+ */
+static void
+sgsap_imsi_det_ind(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* MME name	MME name 9.4.13	M	TLV	57 */
+	/* IMSI Detach from non-EPS service type	IMSI detach from non-EPS service type 9.4.8	M	TLV	3 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.9	SGsAP-LOCATION-UPDATE-ACCEPT message
+ */
+static void
+sgsap_imsi_loc_update_acc(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* Location area identifier	Location area identifier 9.4.11	M	TLV	7 */
+	ELEM_MAND_TLV(0x04, GSM_A_PDU_TYPE_COMMON, DE_LAI, NULL);
+	/* New TMSI, or IMSI	Mobile identity 9.4.14	O	TLV	6-10 */
+	ELEM_OPT_TLV(0x0e,GSM_A_PDU_TYPE_COMMON, DE_MID, " - New TMSI, or IMSI");
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.10	SGsAP-LOCATION-UPDATE-REJECT message
+ */
+static void
+sgsap_imsi_loc_update_rej(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* Reject cause	Reject cause 9.4.16	M	TLV	3 */
+	/* Location area identifier	Location area identifier 9.4.11	O	TLV	7 */
+	ELEM_OPT_TLV(0x04, GSM_A_PDU_TYPE_COMMON, DE_LAI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.11	SGsAP-LOCATION-UPDATE-REQUEST message
+ */
+
+static void
+sgsap_imsi_loc_update_req(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* MME name	MME name 9.4.13	M	TLV	57 */
+	ELEM_MAND_TLV(0x09, SGSAP_PDU_TYPE, DE_SGSAP_MME_NAME, NULL);
+	/* EPS location update type	EPS location update type 9.4.2	M	TLV	3 */
+	ELEM_MAND_TLV(0x0a, SGSAP_PDU_TYPE, DE_SGSAP_EPS_LOC_UPD_TYPE, NULL);
+	/* New location area identifier	Location area identifier 9.4.11	M	TLV	7 */
+	ELEM_MAND_TLV(0x04, GSM_A_PDU_TYPE_COMMON, DE_LAI, NULL);
+	/* Old location area identifier	Location area identifier 9.4.11	O	TLV	7 */
+	ELEM_OPT_TLV(0x04, GSM_A_PDU_TYPE_COMMON, DE_LAI, " - Old location area identifier");
+	/* TMSI status	TMSI status 9.4.21	O	TLV	3 */
+	ELEM_OPT_TLV( 0x07 , GSM_A_PDU_TYPE_GM, DE_TMSI_STAT , NULL );
+	/* IMEISV	IMEISV 9.4.5	O	TLV	10 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.12	SGsAP-MM-INFORMATION-REQUEST
+ */
+static void
+sgsap_mm_info_req(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* MM information	MM information 9.4.12	M	TLV	3-n */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.13	SGsAP-PAGING-REJECT message
+ */
+static void
+sgsap_paging_rej(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* SGs Cause	SGs Cause 9.4.18	M	TLV	3 */
+	ELEM_MAND_TLV(0x08, SGSAP_PDU_TYPE, DE_SGSAP_SGS_CAUSE, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.14	SGsAP-PAGING-REQUEST message
+ */
+static void
+sgsap_paging_req(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* VLR name	VLR name 9.4.22	M	TLV	3-n */
+	ELEM_MAND_TLV(0x02, SGSAP_PDU_TYPE, DE_SGSAP_VLR_NAME, NULL);
+	/* Service indicator	Service indicator 9.4.17	M	TLV	3 */
+	ELEM_MAND_TLV(0x20, SGSAP_PDU_TYPE, DE_SGSAP_SERV_INDIC, NULL);
+	/* TMSI	TMSI 9.4.20	O	TLV	6 */
+	ELEM_OPT_TLV(0x03, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* CLI	CLI 9.4.1	O	TLV	3-14 */
+	ELEM_OPT_TLV(0x1c, GSM_A_PDU_TYPE_DTAP, DE_CLG_PARTY_BCD_NUM, " - CLI");
+	/* Location area identifier	Location area identifier 9.4.11	O	TLV	7 */
+	ELEM_OPT_TLV(0x04, GSM_A_PDU_TYPE_COMMON, DE_LAI, NULL);
+	/* Global CN-Id	Global CN-Id 9.4.4	O	TLV	7 */
+	/* SS code	SS code 9.4.19	O	TLV	3 */
+	/* LCS indicator	LCS indicator 9.4.10	O	TLV	3 */
+	/* LCS client identity	LCS client identity 9.4.9	O	TLV	3-n */
+	/* Channel needed	Channel needed 9.4.23	O	TLV	3 */
+	/* eMLPP Priority	eMLPP Priority 9.4.24	O	TLV	3 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.15	SGsAP-RESET-ACK message
+ */
+static void
+sgsap_reset_ack(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* MME name	MME name 9.4.13	C	TLV	57 */
+	ELEM_OPT_TLV(0x09, SGSAP_PDU_TYPE, DE_SGSAP_MME_NAME, NULL);
+	/* VLR name	VLR name 9.4.22	C	TLV	3-n */
+	ELEM_OPT_TLV(0x02, SGSAP_PDU_TYPE, DE_SGSAP_VLR_NAME, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.16	SGsAP-RESET-INDICATION message
+ */
+static void
+sgsap_reset_ind(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* MME name	MME name 9.4.13	C	TLV	57 */
+	ELEM_OPT_TLV(0x09, SGSAP_PDU_TYPE, DE_SGSAP_MME_NAME, NULL);
+	/* VLR name	VLR name 9.4.22	C	TLV	3-n */
+	ELEM_OPT_TLV(0x02, SGSAP_PDU_TYPE, DE_SGSAP_VLR_NAME, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.17	SGsAP-SERVICE-REQUEST message
+ */
+static void
+sgsap_service_req(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/*IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* Service indicator	Service indicator 9.4.17	M	TLV	3 */
+	ELEM_MAND_TLV(0x20, SGSAP_PDU_TYPE, DE_SGSAP_SERV_INDIC, NULL);
+	/* IMEISV	IMEISV 9.4.5	O	TLV	10 */
+	/* UE Time Zone	UE Time Zone 9.4.21b	O	TLV	3 */
+	/* Mobile Station Classmark 2	Mobile Station Classmark 2 9.4.14a	O	TLV	5 */
+	/* TAI	Tracking Area Identity 9.4.21a	O	TLV	7 */
+	ELEM_OPT_TLV(0x23, NAS_PDU_TYPE_EMM, DE_EMM_TRAC_AREA_ID, NULL);
+	/* E-CGI	E-UTRAN Cell Global Identity 9.4.3a	O	TLV	9 */
+	/* UE EMM Mode	UE EMM mode 9.4.21c	O	TLV	3 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.18	SGsAP-STATUS message
+ */
+static void
+sgsap_status(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;
+
+	/* IMSI	IMSI 9.4.6	O	TLV	6-10 */
+	ELEM_OPT_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* SGs cause	SGs cause 9.4.18	M	TLV	3 */
+	ELEM_MAND_TLV(0x08, SGSAP_PDU_TYPE, DE_SGSAP_SGS_CAUSE, NULL);
+	/* Erroneous message	Erroneous message 9.4.3	M	TLV	3-n */
+	ELEM_OPT_TLV(0x1e, SGSAP_PDU_TYPE, DE_SGSAP_ERR_MSG, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.19	SGsAP-TMSI-REALLOCATION-COMPLETE message
+ */
+static void
+sgsap_tmsi_realloc_comp(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;	
+	
+	/*IMSI	IMSI 9.4.6	M	TLV	6-10  */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.20	SGsAP-UE-ACTIVITY-INDICATION message
+ */
+static void
+sgsap_ue_act_ind(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;	
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.21	SGsAP-UE-UNREACHABLE message
+ */
+static void
+sgsap_ue_unreachable(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;	
+
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* SGs cause	SGs cause 9.4.18	M	TLV	3 */
+	ELEM_MAND_TLV(0x08, SGSAP_PDU_TYPE, DE_SGSAP_SGS_CAUSE, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.22	SGsAP-UPLINK-UNITDATA message
+ */
+static void
+sgsap_ue_ul_unitdata(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;	
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* NAS message container	NAS message container 9.4.15	M	TLV	4-253 */
+	/* IMEISV	IMEISV 9.4.5	O	TLV	10 */
+	/* UE Time Zone	UE Time Zone 9.4.21b	O	TLV	3 */
+	/* Mobile Station Classmark 2	Mobile Station Classmark 2 9.4.14a	O	TLV	5 */
+	/* TAI	Tracking Area Identity 9.4.21a	O	TLV	7 */
+	ELEM_OPT_TLV(0x23, NAS_PDU_TYPE_EMM, DE_EMM_TRAC_AREA_ID, NULL);
+	/* E-CGI	E-UTRAN Cell Global Identity 9.4.3a	O	TLV	9 */
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+/*
+ * 8.23	SGsAP-RELEASE-REQUEST message
+ */
+static void
+sgsap_release_req(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len)
+{
+	guint32	curr_offset;
+	guint32	consumed;
+	guint	curr_len;
+
+	curr_offset = offset;
+	curr_len = len;	
+
+	/* IMSI	IMSI 9.4.6	M	TLV	6-10 */
+	ELEM_MAND_TLV(0x01, GSM_A_PDU_TYPE_BSSMAP, BE_IMSI, NULL);
+	/* SGs cause	SGs cause 9.4.18	O	TLV	3 */
+	ELEM_MAND_TLV(0x08, SGSAP_PDU_TYPE, DE_SGSAP_SGS_CAUSE, NULL);
+
+	EXTRANEOUS_DATA_CHECK(curr_len, 0);
+}
+
+/*
+ * 8.24	SGsAP-SERVICE-ABORT-REQUEST message
+ */
+/* No IE's */
+
+/* 
+ * 9.2	Message type
+ */
+static const value_string sgsap_msg_strings[] = {
+	{ 0x01,	"SGsAP-PAGING-REQUEST"},		/* 	8.14 */
+	{ 0x02,	"SGsAP-PAGING-REJECT"},			/* 	8.13 */
+/*
+ * 0 0 0 0 0 0 1 1
+ * to
+ * 0 0 0 0 0 1 0 1	
+ * Unassigned: treated as an unknown Message type
+ */
+	{ 0x03,	"Unassigned"},							/* 7 */
+	{ 0x04,	"Unassigned"},							/* 7 */
+	{ 0x05,	"Unassigned"},							/* 7 */
+
+	{ 0x06,	"SGsAP-SERVICE-REQUEST"},				/* 8.17 */
+	{ 0x07,	"SGsAP-DOWNLINK-UNITDATA"},				/* 8.4 */
+	{ 0x08,	"SGsAP-UPLINK-UNITDATA"},				/* 8.22 */
+	{ 0x09,	"SGsAP-LOCATION-UPDATE-REQUEST"},		/* 8.11 */
+	{ 0x0a,	"SGsAP-LOCATION-UPDATE-ACCEPT"},		/* 8.9 */
+	{ 0x0b,	"SGsAP-LOCATION-UPDATE-REJECT"},		/* 8.10 */
+	{ 0x0c,	"SGsAP-TMSI-REALLOCATION-COMPLETE"},	/* 8.19 */
+	{ 0x0d,	"SGsAP-ALERT-REQUEST"},					/* 8.3 */
+	{ 0x0e,	"SGsAP-ALERT-ACK"},						/* 8.1 */
+	{ 0x0f,	"SGsAP-ALERT-REJECT"},					/* 8.2 */
+	{ 0x10,	"SGsAP-UE-ACTIVITY-INDICATION"},		/* 8.20 */
+	{ 0x11,	"SGsAP-EPS-DETACH-INDICATION"},			/* 8.6 */
+	{ 0x12,	"SGsAP-EPS-DETACH-ACK"},				/* 8.5 */
+	{ 0x13,	"SGsAP-IMSI-DETACH-INDICATION"},		/* 8.8 */
+	{ 0x14,	"SGsAP-IMSI-DETACH-ACK"},				/* 8.7 */
+	{ 0x15,	"SGsAP-RESET-INDICATION"},				/* 8.16 */
+	{ 0x16,	"SGsAP-RESET-ACK"},						/* 8.15 */
+	{ 0x17,	"SGsAP-SERVICE-ABORT-REQUEST"},			/* 8.24 */
+/*
+ * 0 0 0 1 1 0 0 0 
+ * to
+ * 0 0 0 1 1 0 0 1	
+ * Unassigned: treated as an unknown Message type
+ */
+ 	{ 0x18,	"Unassigned"},
+ 	{ 0x19,	"Unassigned"},
+
+	{ 0x1a,	"SGsAP-MM-INFORMATION-REQUEST"},		/* 8.12 */
+	{ 0x1b,	"SGsAP-RELEASE-REQUEST"},				/* 8.23 */
+/*
+ * 0 0 0 1 1 1 0 0	Unassigned: treated as an unknown Message type	7
+ */
+	{ 0x1c,	"Unassigned"},			/* 8.12 */
+
+	{ 0x1d,	"SGsAP-STATUS"},			/* 8.18 */
+	{ 0x1e,	"Unassigned"},
+	{ 0x1f,	"SGsAP-UE-UNREACHABLE"},			/* 8.21 */
+	{ 0,	NULL }
+};
+
+#define	NUM_SGSAP_MSG (sizeof(sgsap_msg_strings)/sizeof(value_string))
+static gint ett_sgsap_msg[NUM_SGSAP_MSG];
+static void (*sgsap_msg_fcn[])(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len) = {
+	sgsap_paging_req,			/* 0x01,	"SGsAP-PAGING-REQUEST"	8.14 */
+	sgsap_paging_rej,			/* 0x02,	"SGsAP-PAGING-REJECT"	8.13 */
+/*
+ * 0 0 0 0 0 0 1 1
+ * to
+ * 0 0 0 0 0 1 0 1	
+ * Unassigned: treated as an unknown Message type
+ */
+	NULL,							/* 0x03,	"Unassigned" 7 */
+	NULL,							/* 0x04,	"Unassigned" 7 */
+	NULL,							/* 0x05,	"Unassigned" 7 */
+
+	sgsap_service_req,				/* 0x06,	"SGsAP-SERVICE-REQUEST" 8.17 */
+	sgsap_dl_unitdata,				/* 0x07,	"SGsAP-DOWNLINK-UNITDATA" 8.4 */
+	sgsap_ue_ul_unitdata,			/* 0x08,	"SGsAP-UPLINK-UNITDATA" 8.22 */
+	sgsap_imsi_loc_update_req,		/* 0x09,	"SGsAP-LOCATION-UPDATE-REQUEST" 8.11 */
+	sgsap_imsi_loc_update_acc,		/* 0x0a,	"SGsAP-LOCATION-UPDATE-ACCEPT" 8.9 */
+	sgsap_imsi_loc_update_rej,		/* 0x0b,	"SGsAP-LOCATION-UPDATE-REJECT" 8.10 */
+	sgsap_tmsi_realloc_comp,		/* 0x0c,	"SGsAP-TMSI-REALLOCATION-COMPLETE"  8.19 */
+	sgsap_alert_req,				/* 0x0d,	"SGsAP-ALERT-REQUEST" 8.3 */
+	sgsap_alert_ack,				/* 0x0e,	"SGsAP-ALERT-ACK" 8.1 */
+	sgsap_alert_rej,				/* 0x0f,	"SGsAP-ALERT-REJECT" 8.2 */
+	sgsap_ue_act_ind,				/* 0x10,	"SGsAP-UE-ACTIVITY-INDICATION" 8.20 */
+	sgsap_eps_det_ind,				/* 0x11,	"SGsAP-EPS-DETACH-INDICATION" 8.6 */
+	sgsap_eps_det_ack,				/* 0x12,	"SGsAP-EPS-DETACH-ACK" 8.5 */
+	sgsap_imsi_det_ind,				/* 0x13,	"SGsAP-IMSI-DETACH-INDICATION" 8.8 */
+	sgsap_imsi_det_ack,				/* 0x14,	"SGsAP-IMSI-DETACH-ACK" 8.7 */
+	sgsap_reset_ind,				/* 0x15,	"SGsAP-RESET-INDICATION" 8.16 */
+	sgsap_reset_ack,				/* 0x16,	"SGsAP-RESET-ACK" 8.15 */
+	NULL,/* No IE's */				/* 0x17,	"SGsAP-SERVICE-ABORT-REQUEST" 8.24 */
+/*
+ * 0 0 0 1 1 0 0 0 
+ * to
+ * 0 0 0 1 1 0 0 1	
+ * Unassigned: treated as an unknown Message type
+ */
+ 	NULL,							/* 0x18,	"Unassigned" */
+ 	NULL,							/* 0x19,	"Unassigned" */
+
+	sgsap_mm_info_req,				/* 0x1a,	"SGsAP-MM-INFORMATION-REQUEST" 8.12 */
+	sgsap_release_req,				/* 0x1b,	"SGsAP-RELEASE-REQUEST" 8.23 */
+/*
+ * 0 0 0 1 1 1 0 0	Unassigned: treated as an unknown Message type	7
+ */
+	NULL,							/* 0x1c,	"Unassigned" */
+
+	sgsap_status,					/* 0x1d,	"SGsAP-STATUS" 8.18 */
+	NULL,							/* 0x1e,	"Unassigned" */
+	sgsap_ue_unreachable,			/* 0x1f,	"SGsAP-UE-UNREACHABLE" 8.21 */
+
+	NULL,	/* NONE */
+};
+
+void get_sgsap_msg_params(guint8 oct, const gchar **msg_str, int *ett_tree, int *hf_idx, msg_fcn *msg_fcn)
+{
+	gint			idx;
+
+	*msg_str = match_strval_idx((guint32) (oct & 0xff), sgsap_msg_strings, &idx);
+	*ett_tree = ett_sgsap_msg[idx];
+	*hf_idx = hf_sgsap_msg_type;
+	*msg_fcn = sgsap_msg_fcn[idx];
+
+	return;
+}
+
+
+static void
+dissect_sgsap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	proto_item		*item;
+	proto_tree		*sgsap_tree;
+	int				offset = 0;
+	guint32			len;
+	const gchar		*msg_str;
+	gint			ett_tree;
+	int				hf_idx;
+	void			(*msg_fcn)(tvbuff_t *tvb, proto_tree *tree, guint32 offset, guint len);
+	guint8			oct;
+
+	/* Save pinfo gpinfo = pinfo;*/
+	len = tvb_length(tvb);
+
+	/* Make entry in the Protocol column on summary display */
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, PSNAME);
+
+	item = proto_tree_add_item(tree, proto_sgsap, tvb, 0, -1, FALSE);
+	sgsap_tree = proto_item_add_subtree(item, ett_sgsap);
+
+	/* Messge type IE*/
+	oct = tvb_get_guint8(tvb,offset);
+	msg_fcn = NULL;
+	ett_tree = -1;
+	hf_idx = -1;
+	msg_str = NULL;
+
+	get_sgsap_msg_params(oct, &msg_str, &ett_tree, &hf_idx, &msg_fcn);
+
+	if(msg_str){
+		col_add_fstr(pinfo->cinfo, COL_INFO, "%s", msg_str);
+	}else{
+		proto_tree_add_text(tree, tvb, offset, 1,"Unknown message 0x%x",oct);
+		return;
+	}
+
+	/*
+	 * Add SGSAP message name
+	 */
+	proto_tree_add_item(tree, hf_idx, tvb, offset, 1, FALSE);
+	offset++;
+
+
+	/*
+	 * decode elements
+	 */
+	if (msg_fcn == NULL)
+	{
+		proto_tree_add_text(tree, tvb, offset, len - offset,
+			"Message Elements");
+	}
+	else
+	{
+		/* If calling any "gsm" ie dissectors needing pinfo */
+		gsm_a_dtap_pinfo = pinfo;
+		(*msg_fcn)(tvb, tree, offset, len - offset);
+	}
+
+}
+
+
+
+void proto_register_sgsap(void) {
+	guint		i;
+	guint		last_offset;
+
+	/* List of fields */
+
+  static hf_register_info hf[] = {
+	{ &hf_sgsap_msg_type,
+		{ "SGSAP Message Type",	"sgsap.msg_type",
+		FT_UINT8, BASE_HEX, VALS(sgsap_msg_strings), 0x0,
+		NULL, HFILL }
+	},
+	{ &hf_sgsap_elem_id,
+		{ "Element ID",	"sgsap.elem_id",
+		FT_UINT8, BASE_DEC, NULL, 0x0,
+		NULL, HFILL }
+	},
+	{ &hf_sgsap_eps_location_update_type,
+		{ "EPS location update type",	"sgsap.eps_location_update_type",
+		FT_UINT8, BASE_DEC, VALS(sgsap_eps_location_update_type_values),0x0,
+		NULL, HFILL }
+	},
+	{ &hf_sgsap_service_indicator_value,
+		{ "Service indicator",	"sgsap.service_indicator",
+		FT_UINT8, BASE_DEC, VALS(sgsap_service_indicator_values),0x0,
+		NULL, HFILL }
+	},
+	{ &hf_sgsap_sgs_cause,
+		{ "SGs cause",	"sgsap.sgs_cause",
+		FT_UINT8, BASE_DEC, VALS(sgsap_sgs_cause_values),0x0,
+		NULL, HFILL }
+	},
+  };
+
+	/* Setup protocol subtree array */
+#define	NUM_INDIVIDUAL_ELEMS	1
+	gint *ett[NUM_INDIVIDUAL_ELEMS +
+		  NUM_SGSAP_ELEM +
+		  NUM_SGSAP_MSG];
+
+	ett[0] = &ett_sgsap;
+
+	last_offset = NUM_INDIVIDUAL_ELEMS;
+
+	for (i=0; i < NUM_SGSAP_ELEM; i++, last_offset++)
+	{
+		ett_sgsap_elem[i] = -1;
+		ett[last_offset] = &ett_sgsap_elem[i];
+	}
+
+	for (i=0; i < NUM_SGSAP_MSG; i++, last_offset++)
+	{
+		ett_sgsap_msg[i] = -1;
+		ett[last_offset] = &ett_sgsap_msg[i];
+	}
+
+	/* Register protocol */
+	proto_sgsap = proto_register_protocol(PNAME, PSNAME, PFNAME);
+	/* Register fields and subtrees */
+	proto_register_field_array(proto_sgsap, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+ 
+	/* Register dissector */
+	register_dissector(PFNAME, dissect_sgsap, proto_sgsap);
+}
+
+void
+proto_reg_handoff_sgsap(void)
+{
+	/* The registered SCTP port number for SGsAP is 29118.
+     * The payload protocol identifier to be used for SGsAP is 0.
+	 */
+	static gboolean Initialized=FALSE;
+	static dissector_handle_t sgsap_handle;
+	static guint SctpPort;
+
+	sgsap_handle = find_dissector("sgsap");
+
+	if (!Initialized) {
+		dissector_add_handle("sctp.port", sgsap_handle);   /* for "decode-as"  */
+		Initialized=TRUE;
+	} else {
+		if (SctpPort != 0) {
+			dissector_delete_uint("sctp.port", SctpPort, sgsap_handle);
+		}
+	}
+
+	SctpPort=gbl_sgsapSctpPort;
+	if (SctpPort != 0) {
+		dissector_add_uint("sctp.port", SctpPort, sgsap_handle);
+	}
+}