[Freeswitch-users] FS changes to transcoding after hold

[Anthony Minessale]

you could try setting execute_on_answer variable to lock in the codec

Make an extension in the same context "assuming default for this example"

<extension name="lock_codec">


  <condition field="destination_number" expression="^lock_codec$">
    <action application="set"
data="absolute_codec_string=${rtp_use_codec_name}"/>
  </condition>
</extension>


In your normal call processing extension add this condition before calling
bridge:

<action application="set" data="execute_on_answer=execute_extension
lock_codec XML default"/>


Then when the channel is answered it will execute the extension and set the
absolute_codec_string to whatever codec was first negotiated, that should
limit what it will choose on the re-invite.

You can probably set it on both legs with "export" instead of set or by
adding it also to the {} before bridge.


Dialplan: sofia/internal/1007 at 192.168.168.35 Regex (PASS) [lock_codec]
destination_number(lock_codec) =~ /^lock_codec$/ break=on-false

Dialplan: sofia/internal/1007 at 192.168.168.35 Action
set(absolute_codec_string=${rtp_use_codec_name})

2016-12-14 00:51:19.722495 [NOTICE] switch_core_session.c:2966 Execute
set(absolute_codec_string=${rtp_use_codec_name})

EXECUTE sofia/internal/1007 at 192.168.168.35 set(absolute_codec_string=PCMU)

2016-12-14 00:51:19.722495 [DEBUG] mod_dptools.c:1562 SET sofia/internal/
1007 at 192.168.168.35 [absolute_codec_string]=[PCMU]


On Mon, Dec 12, 2016 at 12:37 AM, Joshua Gigg <giggsey at gmail.com> wrote:

> I opened a JIRA on a related note earlier this year, because when you have
> this call recorded, and it gets switched between G711 and G722, it messes
> up the recording.
>
> On Mon, 12 Dec 2016, 04:11 Sebastian Kemper, <sebastian_ml at gmx.net> wrote:
>
>> On Fri, Dec 09, 2016 at 10:47:35PM +0100, Sebastian Kemper wrote:
>>
>> <snip>
>>
>> > It's probably not the smartest move for the phone to renegotiate codecs
>> > at this point. But I think FS should be able to deal with it (without
>> > simply falling back to transcoding). I've tried if putting
>> > "disable-transcoding" into the profiles changes anything, but it didn't.
>> > "renegotiate-codec-on-hold" and "renegotiate-codec-on-reinvite" are
>> gone
>> > since FS 1.6.10 so I can't try those. I read something about
>> > "indicate_hold" which probably means that FS will send a reINVITE on the
>> > other leg, so I might try that.
>>
>> I thought about it some more and came to the conclusion that for a B2BUA
>> it does seem legit to accept the first codec in the reINVTIE's offer and
>> use transcoding to make the bridge work. It's not what I would like to
>> happen, but that's a different story :D
>>
>> I also found a posting from 2011 which mentions this behavior:
>> http://lists.freeswitch.org/pipermail/freeswitch-users/
>> 2011-December/078228.html
>>
>> Anyway, "case closed".
>>
>> Regards,
>> Sebastian
>>
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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