Osmocom Media Gateway (RTP proxy and RTP/E1 gateway)
https://osmocom.org/projects/osmo-mgw
Philipp Maier
2bfa708527
When two codecs are checked for convertibility we insist that subtype_name and rate are equal since normally when those are different, we assume a completely different codec that will require a transcoder, which we do not have yet. However when IuFP is used, the call agent will always negotiate IuFP as VND.3GPP.IUFP with a rate of 16000, even though the IuFP payloads contain regular AMR at a rate of 8000. This means that if we detect IuFP on one side of the call leg and AMR on the other side of the call leg, we must not insist on equal subtype_name and rate. This fixes the following TTCN3 testcases: MGCP_Test.TC_two_crcx_mdcx_and_iuup_rtp MGCP_Test.TC_two_crcx_mdcx_and_iuup_rtp_rfci_unordered Related: OS#5461 Change-Id: I6bc1e6022efe21cb893ef213f3da35017960357d |
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README
About OsmoMGW ============= OsmoMGW originated from the OpenBSC project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in typical GSM networks. OsmoMGW was one of the parts split off from the old openbsc.git. It originated as a solution to merely navigate RTP streams through a NAT, but has since matured to a Media Gateway implementation that is capable of streaming RTP for 2G (AoIP) and 3G (IuCS) GSM networks as well as (still not implemented at time of writing) transcoding between TRAU, various RTP payloads and IuUP. The OsmoMGW program exposes an MGCP interface towards clients like OsmoMSC and OsmoBSC, and receives and sends RTP streams as configured via MGCP. The libosmo-mgcp-client library exposes utilities used by e.g. OsmoMSC (found in osmo-msc.git) to instruct OsmoMGW via its MGCP service. Find OsmoMGW issue tracker and wiki online at https://osmocom.org/projects/osmo-mgw https://osmocom.org/projects/osmo-mgw/wiki