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
email: david.ponzone@ipeva.fr
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
tel:      0811 46 26 26

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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@sns.eu>
To: "FreeSWITCH Users Help"<freeswitch-users@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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