[Freeswitch-users] Choice of codecs for incoming call

[Steven Ayre]

The client sends the list of codecs it supports in the INVITE (PCMA+PCMU).

FS will check check that against the list of codecs it supports, and select
just *one* codec that's supported by both. That's returned by FS in the SDP
of the 183 (if any) and 200. If there's no codec supported by both sides
then you get 488.

There are parameters that influence when and which codec is selected, but
you end up with only one codec in use for any particular call.

In this case it's selected the first supported codec, PCMU.

-Steve
* *

On 1 February 2013 11:18, Александр Мустафин
<mustafin.aleksandr at gmail.com>wrote:

> Hello.
>
> My FS receive INVITE with 2 codecs in SDP: PCMA and PCMU. After hunting
> dialplan, this call forwarding to IVR, and I see next message in log:
>
> 2013-01-31 01:23:22.388780 [DEBUG] sofia_glue.c:5094 Audio Codec Compare
> [PCMU:0:8000:20:64000]/[PCMU:0:8000:20:64000]
> 2013-01-31 01:23:22.388780 [DEBUG] sofia_glue.c:3077 Set Codec
> sofia/internal/9089080908 at PSTN PCMU/8000 20 ms 160 samples 64000 bits
> 2013-01-31 01:23:22.388780 [DEBUG] switch_core_codec.c:111
> sofia/internal/9089080908 at PSTN Original read codec set to PCMU:0
>
> And FS send 200 OK to remote side with one codec in SDP: PCMU.
>
> My parameters:
>
> In internal.xml (profile)
> <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
> <param name="outbound-codec-prefs" value="$${global_codec_prefs}"/>
>
> In vars.xml
> <X-PRE-PROCESS cmd="set"
> data="global_codec_prefs=PCMU,PCMA,G729,G722,GSM"/>
> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMU,PCMA,G729,GSM"/>
> <X-PRE-PROCESS cmd="set" data="inbound_codec_prefs=PCMU,PCMA,G729,GSM"/>
>
> This is normal behavior?How can I manage set of codec in inbound calls?
>
> Best regards, Alexander.
>
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