I'm having problems when I use an incoming VoIP dial-peer instead of using Default dial-peer 0. A lot of calls are rejected with SIP 488 Not acceptable here - SDP-NOT-SUPPORTED.
I'm using SIP as Signaling Protocol.
dial-peer voice 97 voip
incoming called-number 7..........$
fax-relay ecm disable
fax rate 9600
fax protocol t38 ls-redundancy 2 hs-redundancy 0 fallback pass-through g711alaw
Help. Any clues?
The reason this is happening is because dial peer 0 supports all codecs by default. This dial peer is only going to accept G.729 calls, because that's the default codec for voip dial peers.
You would either want to configure the 'codec ' that the other side is wanting to use, or set up a voice-class codec with the codecs you'll accept.
That or they're sending something funky like SRTP, but if dial peer 0 is working this probably isn't the case.