I'm doing interworking test with 3rd party VoIP GW and I encounter problem with G.723 (6.3K)codec on 2600 router. Call from Cisco2600 to VoIPGW works OK, but call from VoIP GW to Cisco 2600 can not be established with G.723. It is rejected from some unkown reason and established with G.711 (second codec preference on VoIP GW is G.711). G.711 and G.729 are working OK both-way.
Has anyone experiance this behaivor? Is it possible to configure codec preference on POTS dial-peer to support only G.723.
Unfortunately this is not the case here. I'm looking for a solution where I can set preference for codecs on POTS side (not VoIP). Meanwhile we discover if VoIP GW offers codecs G.729 in G.711, Cisco selects G.729; if VoIP GW offers G.723 and G.711 Cisco selects G.711.
There is no way you can configure set of preference codec on pots side. Codec is only used on VoIP side, having said that have you configured class and defined g.723 as your first preference codec and g711 as second. Also make sure under voice card command you have complexity high. It is possible that gateway may try to choose g723 codec first but since the dsp does not support the codec it falls to g711. You can also confirm this by running "debug vtsp all".
You can achieve what you want . Just past the config on your 2600 as is it will do your required work. Now you can support the list of codecs on your 2600 for termination you can play with the list as per your reuqirment.
voice class codec 1
codec preference 1 g723ar63
codec preference 2 g723ar53
codec preference 3 g723r63
codec preference 4 g723r53
codec preference 5 g729br8
codec preference 6 g729r8
codec preference 7 g726r16
codec preference 8 g728
codec preference 9 g726r24
codec preference 10 g726r32
dial-peer voice 11 voip
incoming called-number .
voice-class codec 1
you can understand what i did by studying the VoIP call legs on cisco.
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