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# Mobile Originated call handled via OsmoNITB with RTP proxy or E1 BTS # and external MNCC Handler
msc {
hscale="4";
ms [label="MS"], bts [label="BTS"], nitb [label="OsmoNITB"], emh [label="External MNCC Hdlr"];
|||;
... [label="Mobile Originated call handled via OsmoNITB with RTP proxy or E1 BTS and external MNCC Handler"];
|||;
--- [label="User on A-side dials a MO call from his phone"];
ms <=> nitb [label="RF Channel Establishment"];
...;
# MS sends CC SETUP, deliver it to MNCC
ms -> nitb [label="CC SETUP [MSISDN]"];
nitb rbox nitb [label="CSTATE_INITIATED"];
nitb -> emh [label="MNCC-SETUP.ind [CALLING, BEARER_CAP,
FACILITY, CALLED, USERUSER, SSVERSION, CCCAP"];
emh rbox emh [label="1 CALL_INIT"];
...;
nitb <- emh [label="MNCC-CALL-PROC.req [BEARER_CAP, FACILITY, PROGRESS]"];
emh rbox emh [label="3 MO_CALL_PROC"];
nitb rbox nitb [label="CSTATE_MO_CALL_PROC"];
ms <- nitb [label="CC CALL PROCEDING"];
...;
# optional
--- [label="Optional PROGRESS, can happen 0-N times"];
nitb <- emh [label="MNCC-PROGRESS.req [USERUSER]"];
emh rbox emh [label="3 MO_CALL_PROC"];
ms <- nitb [label="CC PROCEDING"];
...;
# optional
--- [label="Optional; Indicates when B-side is ringing"];
nitb <- emh [label="MNCC-ALERT.req [FACILITY, PROGRESS, USERUSER]"];
emh rbox emh [label="4 CALL_DELIVERED"];
nitb rbox nitb [label="CSTATE_CALL_DELIVERED"];
ms <- nitb [label="CC ALERTING"];
...;
# ask the BTS to connect its RTP stream to the given IP+PORT
--- [label="Exact time of MNCC_FRAME_RECV is up to Ext MNCC Hdlr"];
nitb <- emh [label="MNCC_FRAME_RECV[.req]"];
ms -> nitb [label="TCH Voice Frame (TRAU or RTP)"];
nitb ->emh [label="{GSM_{TCHF,TCHH}_FRAME,GSM_TCHF_FRAME_EFR,GSM_TCH_FRAME_AMR}"];
ms -> nitb [label="TCH Voice Frame (TRAU or RTP)"];
nitb ->emh [label="{GSM_{TCHF,TCHH}_FRAME,GSM_TCHF_FRAME_EFR,GSM_TCH_FRAME_AMR}"];
... [label="Unidirectional voice frames continue"];
--- [label="User on B-side answers the call"];
nitb <- emh [label="MNCC-SETUP.rsp [FACILITY, PROGRERSS, CONNETED, USERUSER]"];
emh rbox emh [label="? CONNECT_INDICATION"];
nitb rbox nitb [label="CSTATE_CONNECT_IND"];
ms <- nitb [label="CC CONNECT"];
...;
ms -> nitb [label="TCH Voice Frame (TRAU or RTP)"];
nitb ->emh [label="{GSM_{TCHF,TCHH}_FRAME,GSM_TCHF_FRAME_EFR,GSM_TCH_FRAME_AMR}"];
...;
nitb <- emh [label="{GSM_{TCHF,TCHH}_FRAME,GSM_TCHF_FRAME_EFR,GSM_TCH_FRAME_AMR}"];
ms <- nitb [label="TCH Voice Frame (TRAU or RTP)"];
... [label="Bi-directional voice frames continue"];
ms -> nitb [label="CC CONNECT ACK"];
nitb rbox nitb [label="CSTATE_ACTIVE"];
nitb -> emh [label="MNCC-SETUP-COMPL.ind"];
emh rbox emh [label="10 ACTIVE"];
...;
...;
...;
--- [label="User on A-side hangs up the call"];
ms -> nitb [label="CC DISCONNECT"];
nitb rbox nitb [label="CSTATE_DISCONNET_REQ"];
nitb -> emh [label="MNCC-DISC.ind [CAUSE, FACILITY, USERUSER, SSVERSION]"];
emh rbox emh [label="12 DISCONNET_IND"];
...;
nitb <- emh [label="MNCC-RELEASE.req [CAUSE, FACILITY, USERUSER]"];
emh rbox emh [label="19 RELEASE_REQ"];
nitb rbox nitb [label="CSTATE_RELEASE_REQ"];
ms <- nitb [label="CC RELEASE"];
...;
ms -> nitb [label="CC RELEASE COMPLETE"];
nitb -> emh [label="MNCC-RELEASE.cnf [CAUSE, FACILITY, USERUSER, SSVERSION]"];
...;
ms <=> nitb [label="RF Channel Release"];
...;
}
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