[Freeswitch-users] How to force the usage of g729 instead of g729b

[David Ponzone]

Jan,

For outbound, I do it this way:

    <extension name="disable-annexB" continue="true">
      <condition field="${switch_r_sdp}" expression="/(.*)(m=audio \d+ RTP\/AVP)(.*)( 18 )(.*)/s">
        <action application="export" data="sip_append_audio_sdp=a=fmtp:18 annexb=no"/>
      </condition>
    </extension>

For inbound, it's going to be tricky, as I am not sure if there is a way to patch the SDP that FS will send back...

David Ponzone  Direction Technique
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Le 02/12/2010 à 18:48, Jan Riedinger a écrit :

> As far as I know the codec strings for g729 and g729b are the same, 
> despite these codecs are  not compatible according RFC 3555 (at least 
> Cisco is reading the RFC in that way, 
> https://supportforums.cisco.com/docs/DOC-3188).
> 
> 
> Am 02.12.2010 18:12, schrieb Madovsky:
>> Maybe
>> absolute_codec_string will do the trick
>> 
>> ----- Original Message -----
>> From: "Jan Riedinger"<riedinger at sns.eu>
>> To: "FreeSWITCH Users Help"<freeswitch-users at lists.freeswitch.org>
>> Sent: Thursday, December 02, 2010 10:51 AM
>> Subject: [Freeswitch-users] How to force the usage of g729 instead of g729b
>> 
>> 
>> By setting global_codec_prefs and inbound_codec_prefs it's possible to
>> specify, which codecs are supported for inbound calls. How can I specify
>> that the switch shall support g729, but not g729b?
>> 
>> The incoming INVITE message contains a SDP with the media attribute
>> annexb=yes. How has Freeswitch to answer to indicate that g729 is
>> supported but g729b is not supported?
>> 
>> Thank you in advance
>>          Jan
>> 
> 
> -- 
> Jan Riedinger                           Phone :  +49-30-39 73 19 66
> Dipl.-Inf. | Managing Director          Fax   :  +49-30-39 73 19 64
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