[Freeswitch-users] Codec negotiation with ESL socket?

Anthony Minessale anthony.minessale at gmail.com
Tue Mar 18 04:56:21 MSK 2014


Make sure inbound-late-negotiaion is true in the sofia profile.
Then set the variable absolute_codec_string to pcmu on the channel before
executing answer.



On Mon, Mar 17, 2014 at 8:10 PM, Ian McMaster <ian.mcmaster at gmail.com>wrote:

> Our current Polycom phones send the following in the SDP:
>
> a=rtpmap:0 PCMU/8000
>
> a=rtpmap:8 PCMA/8000
>
> a=rtpmap:18 G729/8000
>
> We added a 550 phone and now the preferred coded is G722
>
> *a=rtpmap:9 G722/8000*
>
> a=rtpmap:0 PCMU/8000
>
> a=rtpmap:8 PCMA/8000
>
> a=rtpmap:18 G729/8000
>
> Our IVR application (socket) plays files recorded in PCMU format.
>
> When the new phone connects (G722), the play function is now looking for
> files ending in .G722 (which do not exist).
>
> How do you negotiate a codec without a B leg? I'd like the phone to use
> G722 when connected to other G722 phones, but use PCMU if connected to a
> socket application.
>
> Thank you,
> Ian.
>
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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