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• Patchset:

  • Patch Set #7:

    > I always thought that including the Bearer Capability IE in MO SETUP for a voice call allows to ne […]

    So I've just tested to completely omit the Bearer Capability IE in outgoing MT setup and it looks good with Phase 1 & Phase 2 GSM, and a Smartphone so far.

    Osmo-MSC: `src/libmsc/gsm_04_08_cc.c` function `gsm48_cc_tx_setup()`
     Added: `if(trans->bearer_cap.transfer != GSM48_BCAP_ITCAP_SPEECH)`
                     `gsm48_encode_bearer_cap(msg, 0, &bearer_cap);`

    The codec negotiation still succeeds, the logging shows in case of smartphone to phase 1 GSM call:
     `<0001> msc_a.c:2086 trans(CC:INITIATED ... :CM_SERVICE_REQ ... codecs: ... MS={AMR:octet-align=1#112,GSM-EFR#110,GSM-HR-08#111,GSM#3} bss={GSM#3,GSM-EFR#110,AMR:octet-align=1#112} RAN={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111})`

     `<0001> gsm_04_08_cc.c:1186 trans(CC:CALL_RECEIVED ... :PAGING_RESP ... codecs: ... MS={GSM#3} bss={GSM#3,GSM-EFR#110,AMR:octet-align=1#112} RAN={AMR:octet-align=1#112,GSM-EFR#110,GSM#3,GSM-HR-08#111})`

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