Interfacing with VoIP using osmo-sip-connector

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Suzan Carr
6 years ago
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- introduction Project started approximatly one year ago: Adds a interface to OsmoNITB and OsmoBSC, allowing to connect OsmoNITB and OsmoBSC to be

2 - introduction Project started approximatly one year ago: Adds a interface to OsmoNITB and OsmoBSC, allowing to connect OsmoNITB and OsmoBSC to be connected to any Voip PBX that supports s Replaces the rather complicated LCR approach with a much simpler to use SIP-Only solution 26/04/17 (c) 2017 sysmocom GmbH 2

3 Layout of a typical network Abis BTS Internet OsmoNITB chan_lcr Asterisk (or any other PBX) LCR (linux call router) Osmo-sip-connector does not offer any ISDN capabilities. Migration Is only possible if the ISDN capabilities Of LCR are not needed. 26/04/17 (c) 2017 sysmocom GmbH 3

5 = Mobile Network Call Control Primitives specified in GSM Interfaces and features Real, carriers all signalling- traffic, including DTMF tones (sip INFO messages) No authentication Implemented in and LCR Not to be confused with openbts's sip- Via uinx domain socket registration interface! Via ethernet (TCP) Abis BTS OsmoNITB RTP-Voice 26/04/17 (c) 2017 sysmocom GmbH 5

6 = Mobile Network Call Control Primitives specified in GSM Interfaces and features Real, carriers all signalling- traffic, including DTMF tones (sip INFO messages) No authentication Implemented in and LCR Not to be confused with openbts's sip- Via uinx domain socket registration interface! Via ethernet (TCP) Abis BTS OsmoNITB RTP-Voice Transports all Voice (Audio) traffic Tapped directly at the BTS Payload has the same encoding as the encoding on the air interface => No transcoding! The encodings used on the Air interface must be supported by the other end. 26/04/17 (c) 2017 sysmocom GmbH 6 Via ethernet (UDP)

7 = Mobile Network Call Control Primitives specified in GSM Interfaces and features Real, carriers all signalling- traffic, including DTMF tones (sip INFO messages) No authentication Implemented in and LCR Not to be confused with openbts's sip- Via uinx domain socket registration interface! Via ethernet (TCP) Abis BTS OsmoNITB Osmo-sip-connector RTP-Voice acts as a translator between GSM Call control and SIP is not a a transcoder! implements a call control handler Transports all Voice (Audio) traffic Tapped directly at the BTS Payload has the same encoding as the encoding on the air interface => No transcoding! provides industry standard interfaces to the outside world has a custom, but open interface () towards the osmocom world 26/04/17 (c) 2017 sysmocom GmbH 7 The encodings used on the Air interface must be supported by the other end. Via ethernet (UDP)

8 Configuration: osmo-nitb OsmoNITB's internal handler is disabled and the socket interface is activated, from now on external handlers like or LCR are able to take over call control. Add commandline option -M /path/to/my/mncc-socket The osmo-nitb configuration file is not touched. Commandline: osmo-nitb -c./osmo-nitb.cfg -p./osmo-nitb.pcap -l hlr_1.sqlite3 -M /tmp/bsc_mncc 26/04/17 (c) 2017 sysmocom GmbH 8

9 Configuration: Config file:.cfg Set up the path to your mncc-socket app mncc socket-path /tmp/bsc_mncc sip local remote Set local sip IP-Address and port number Set remote (PBX) IP-Address and port number You may only use if, your PBX software and osmo-bts run on the same machine! Commandline: sudo -c./.cfg Start Startup order does not matter 26/04/17 (c) 2017 sysmocom GmbH 9

Quick Installation guide V1.1

V o I P G S M G A T E BlueGate SIP Quick Installation guide V1.1 Technical parametres Dimensions Weight Operating position Operating condition Power supply 133 x 233 x 60 mm 850 g various temperature: