MNCC<->SIP bridge; attaches to OsmoMSC to interface with external SIP VoIP telephony
https://osmocom.org/projects/osmo-sip-conector
2e2db3e0ad
Add the new SDP section to the MNCC socket protocol, but do not yet implement forwarding SDP from SIP. Implementing SDP forwarding follows in a subsequent patch. It is still possible to establish a call with empty SDP: the new osmo-msc on the MT side, receiving an MNCC_SETUP_REQ, will hit an error log: "Got no information of remote audio codecs: neither SDP nor Bearer Capability. Trying anyway." and then hold thumbs to hit a codec match, analogous to previous behavior. Note that osmo-sip-connector should actually always have encoded a Bearer Capability in the MNCC protocol in the MT MNCC_SETUP_REQ message, but never has. Now we are ready to leapfrog from zero codec info to full SDP. This patch must be merged at the same time as osmo-msc patch Ie16f0804c4d99760cd4a0c544d0889b6313eebb7, so that both sides have a matching MNCC protocol version number. Change-Id: Iaca9ed6611fc5ca8ca749bbbefc31f54bea5e925 |
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| contrib | ||
| debian | ||
| doc | ||
| src | ||
| tests | ||
| .gitignore | ||
| .gitreview | ||
| COPYING | ||
| Makefile.am | ||
| README.asciidoc | ||
| configure.ac | ||
| git-version-gen | ||
| osmoappdesc.py | ||
README.asciidoc
Osmo SIP Connector ================== Simple utility to map MNCC to SIP and SIP to MNCC. The VTY interface can be used to make configurations. The code doesn't have any RTP or transcoding support. Call identities can be either the MSISDN or the IMSI of the subscriber. Requirements of Equipment ^^^^^^^^^^^^^^^^^^^^^^^^^ * DTMF need to be sent using SIP INFO messages. DTMF in RTP is not supported. * BTS+PBX and SIP connector+PBX must be in the same network (UDP must be able to flow directly between these elements) * No handover support. * IP based BTS (e.g. Sysmocom sysmoBTS but no Siemens BS11) * No emergency calls Limitations ^^^^^^^^^^^ * PT of RTP needs to match the one used by the BTS. E.g. AMR needs to use the same PT as the BTS. This is because rtp_payload2 is not yet supported by the osmo-bts software. * AMR SDP file doesn't include the mode-set params and allowed codec modes. This needs to be configured in some way.