MNCC<->SIP bridge; attaches to OsmoMSC to interface with external SIP VoIP telephony https://osmocom.org/projects/osmo-sip-conector
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Holger Hans Peter Freyther adc7484a0c debian: Initial packaging of the osmo-sip-connector 7 years ago
debian debian: Initial packaging of the osmo-sip-connector 7 years ago
doc/examples vty: Work on configuration of the MNCC to SIP gateway 7 years ago
src sip/sdp: Hack to get a GSM codec call connected 7 years ago
.gitignore Initial commit for a MNCC to SIP gateway (and maybe auth GW too) 7 years ago
COPYING Initial commit for a MNCC to SIP gateway (and maybe auth GW too) 7 years ago
Makefile.am Initial commit for a MNCC to SIP gateway (and maybe auth GW too) 7 years ago
README.asciidoc Write down some of the limitations of the current setup 7 years ago
configure.ac Initial commit for a MNCC to SIP gateway (and maybe auth GW too) 7 years ago
git-version-gen Initial commit for a MNCC to SIP gateway (and maybe auth GW too) 7 years ago

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.