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-rw-r--r--openbsc/src/libmsc/msc_ifaces.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/openbsc/src/libmsc/msc_ifaces.c b/openbsc/src/libmsc/msc_ifaces.c
index 3dbe7c3..e54f1e9 100644
--- a/openbsc/src/libmsc/msc_ifaces.c
+++ b/openbsc/src/libmsc/msc_ifaces.c
@@ -195,6 +195,7 @@ static int conn_iu_rab_act_cs(struct gsm_trans *trans)
struct mgcpgw_client *mgcp = conn->network->mgcpgw.client;
struct msgb *msg;
struct msgb *msg_dlcx;
+ uint16_t bts_base;
/* HACK. where to scope the RAB Id? At the conn / subscriber /
* ue_conn_ctx? */
@@ -203,9 +204,14 @@ static int conn_iu_rab_act_cs(struct gsm_trans *trans)
conn->iu.mgcp_rtp_endpoint =
mgcpgw_client_next_endpoint(conn->network->mgcpgw.client);
- /* HACK: the addresses should be known from CRCX response
- * and config. */
- conn->iu.mgcp_rtp_port_ue = 4000 + 2 * conn->iu.mgcp_rtp_endpoint;
+
+ /* This will calculate the port we assign to the BTS via AoIP
+ * assignment command (or rab-assignment on 3G) The BTS will send
+ * its RTP traffic to that port on the MGCPGW side. The MGCPGW only
+ * gets the endpoint ID via the CRCX. It will do the same calculation
+ * on his side too to get knowledge of the rtp port. */
+ bts_base = mgcp->actual.bts_base;
+ conn->iu.mgcp_rtp_port_ue = bts_base + 2 * conn->iu.mgcp_rtp_endpoint;
/* Since we know now the endpoint number, we enforce a DLCX on tha
* endpoint in order to ensure that this endpoint is not occupied