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-   -   PSTN gateway codec order (http://forum.sipbroker.com/showthread.php?t=2400)

green 10-11-2007 09:30 PM

PSTN gateway codec order
Currently when I dial PSTN access number Sipbroker gateway will setup a call with the following codec order:


RTP/AVP 0 18 8 111 97 3 4 101

a=rtpmap:0 PCMU/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:8 PCMA/8000
a=rtpmap:111 G726-32/8000
a=rtpmap:97 iLBC/8000
a=rtpmap:3 GSM/8000
a=rtpmap:4 G723/8000

It will be more logical to make it looking like 0 8 18 111 97 3 4 101,
i.e. puth both PCM codecs first and lower bandwidth codecs after.

This is my real problem. I'm dialing my home VSP using the SIP-code. The SIP account with my home VSP is forwarded permanently to the local PSTN number. As soon as PCMU is not supported by my VSP the call is established with G.729 (according to Sipbroker's preference) while I need G.711A!


martin 10-12-2007 10:08 AM

Depends on the sponsor. Some numbers we physically host so I have made a change to those numbers.

Please confirm the number you were using and if the order has now changed?


green 10-12-2007 08:19 PM

thank you very much. It works!

I tested with New York number +1-646-291-2168
According to the source IP address it's the same server or gateway which serves Sweden access number. Last time I had a problem with that particular number. Thanks again.

green 11-24-2009 09:38 PM

Same problem again :(
Tested with Sipbroker iNum access number 883510074022302

received codec order:

RTP/AVP 18 0 8 111 97 3 4 101
desirable codec order:

RTP/AVP 0 8 18 111 97 3 4 101
Is it possible to fix this? Thanks!

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