[asterisk-users] SIP Codec negotiation

Steve Edwards asterisk.org at sedwards.com
Thu May 17 11:48:17 CDT 2018

> On Fri, May 11, 2018, at 10:36 AM, Steve Edwards wrote:
>> So, Asterisk will defer it's choice of codec to match the codec it detects
>> in the incoming stream?

On Fri, 11 May 2018, Joshua Colp wrote:
> It depends on the channel driver and configuration. The chan_sip module 
> always matching outgoing codec to the incoming codec. The chan_pjsip 
> module has an option to do that (which is on by default).

Is this why I see occasional notices in my log file like:

Dropping incompatible voice frame on SIP/xxx of format ulaw since our 
native format has changed to (gsm)

Thanks in advance,
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST

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