Problem with Incoming VoIP Dial-Peer

Answered Question
Apr 1st, 2009

Hello,


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

description INCOMING

incoming called-number 7..........$

dtmf-relay rtp-nte

fax-relay ecm disable

fax rate 9600

fax protocol t38 ls-redundancy 2 hs-redundancy 0 fallback pass-through g711alaw

no vad


Help. Any clues?

Regards.

Correct Answer by Nicholas Matthews about 7 years 10 months ago

Hi,


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.


-nick

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Correct Answer
Nicholas Matthews Wed, 04/01/2009 - 09:20

Hi,


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.


-nick

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