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Unread 03-07-2007, 11:32 AM   #1
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Default Controlling Codec selection

I can't seem to get VoXaLot to do my bidding with regard to the Codecs... (Using

I have set the Codec for each of the 3 providers to g729 only. I am using a SNOM 320 phone and set the Codec order to G729, GSM, G723, ALaw, ULaw. The resulting Invite contains the following:

m=audio 49156 RTP/AVP 18 3 4 8 0 101
a=rtpmap:18 g729/8000
a=rtpmap:3 gsm/8000
a=rtpmap:4 g723/8000
a=rtpmap:8 pcma/8000
a=rtpmap:0 pcmu/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
The 183 Session Progress and 200 OK messages coming back from Voxalot have:
m=audio 19650 RTP/AVP 0 8 18 3 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
The resulting conversation is using ulaw. How do I stop this behaviour?

Sure I could remove the offending codecs from my list on the phone but it would be better if Voxalot respected the order of selection I made in the first place especially since I have removed all other codecs from the providers setup.
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Unread 03-23-2007, 04:20 AM   #2
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Just in case anyone else has this problem...

This behaviour is cause by having a dial plan entry that uses as a provider.

I though I was being correct by "documenting" all 6 digit numbers are redirected via voxalot (and also 500 and 600).
My tips are:
1. Don't use as a provider in your dial plans.
2. Don't worry if the Test utility in the dial plans section says "A call to:xxxxxx will not get forwarded" and it's a voxalot number. It still works.
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