[sipx-users] ITSP call goes through but no audio

["Matt Keys" <MKeys@xxxxxxxxxxxxxxxxx>]

Title: ITSP call goes through but no audio

I'm testing a SIP trunk to Covista Communications. I'm able to receive and send calls but there's two catches:

1. Placing a call from internal to my cell phone, I do not hear ring tones but the cell phone will ring and caller ID is shown properly. If I answer the cell I do not hear any audio in either direction however according to captures and the phones the call is connected.

2. Inbound calls (cell phone to internal) I hear a ring tone and also see correct caller ID but there's still no audio after answering. Again, all appears normal on captures and the phones.

RTP captures are showing a difference in codecs. G.711 on outbound, example:

22.588943 172.16.1.200 -> 172.16.1.2   RTP PT=ITU-T G.711 PCMU, SSRC=0x94955FF, Seq=27757, Time=688410696

and G.729 inbound, example:

6.758089 172.16.1.200 -> 172.16.1.2   RTP PT=ITU-T G.729, SSRC=0x3CA4274A, Seq=25643, Time=1257971077

Could this be the problem?