I have 2811 with 2xPVDM2-16. There are two SIP trunks, one should be g729 and the other g711. When I make a call from another side to the other with both trunks having g711 everything is fine, call goes through, you can talk etc. However when the codecs are different (transcoding should take place) I can hear the phone ringing but when B side picks up the phone, 2811 sends BYE to the B side. Sdspfarm is registered everything looks fine regarding the transcoders, still seems that transcoding cannot be done. I am using c2800nm-adventerprisek9-mz.124-15.T3.bin.
This seems to be trivial problem but I have already spent quite some time on it.
thanks for the reply. Unfortunately this didn't solve the issue. I have an IOS which should support universal transcoding. So the phone rings but immediatelly as the B side answers, BYE is sent by the router. If the transcoder is not registered (no sccp), the phone doesn't ring at all. So it seems that transcoder is not ignored in the call setup.
Another thing, I noticed now that transcoding is done with no problems g711alaw -> g711ulaw (call goes through, I also see used channels with sh dspfarm all), but with g729 still doesn't work. Could it be that the codec from Cisco and Audio Codec modem are not compatible?
I just wanted to let you know that it is solved. When we put Asterisk instead of AudioCodes it worked right away (above config is fine). However I still find confusing the following. AudioCodes could only use g729A codec (off all the g729 variants) but Asterisk can use "pure" g729. But on dial-peer I can only put g729r8 and g729br8. To get things more confusing, on the transcoder you CAN set g729ar8, g729abr8 and g729r8. So I think with AudioCodes was something like this:
-I called the number
-the right dial-peer was hit
-codec on dial-peer matched the one supported on transcoding, the call establishment went on
-phone answers, sends that the codec it supports is not actually g729 but g729a (which can't be set on dial-peer)
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Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
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