QQ,

I don't see that FreeSWITCH is doing anything incorrect here. According to RFC3264, the offerer (FreeSWITCH) sends an SDP and in the case of RTP, the answerer (GRSIP Gateway) must use the payload type offered, even if the answerer uses a different payload type when it sends a telephone-event.

http://tools.ietf.org/html/rfc3264#section-6.1
Specifically near the end:

"In the case of RTP, it MUST use the payload type numbers
   from the offer, even if they differ from those in the answer."

Technically, FreeSWITCH isn't "changing" anything anyway. The originator of the call (Vox Callcontrol) is the one who chose PT 101 in the INVITE that it sent to FreeSWITCH. FS is just passing that along without modifying it.

I think you need to contact the people running the gateway and make sure that they understand that they are not following RFC3264 if they're rejecting telephone-events in PT 101 simply because they prefer to send in PT 110. Also, if your Vox Callcontrol client has any configuration options then maybe you can tell it to use PT 110 for RFC2833 DTMFs. It is a bit of a workaround but this is SIP, so no one is expecting perfection. :)

-MC

On Wed, Jun 15, 2011 at 12:23 AM, qingquan luo <qingquan@globalroam.com> wrote:
Hi David,
     Thank you for reminder,   I resend this mail in mail list, Because I can not reply preview mail( I make a mistake to subscribe this mail list in Daily Digest mode.)
     So I need resend this mail for require help.  
  
For this issue, I has paste sip debug output in:
information with "sofia global siptrace on"

 Thanks



On Wed, Jun 15, 2011 at 3:15 PM, David Ponzone <david.ponzone@ipeva.fr> wrote:
You have a mail issue. Check your spam...

David Ponzone  Direction Technique
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
tel:      0811 46 26 26

Ce message et toutes les pièces jointes sont confidentiels et établis à l'intention exclusive de ses destinataires. Toute utilisation ou diffusion non autorisée est interdite. Tout message électronique est susceptible d'altération. IPeva décline toute responsabilité au titre de ce message s'il a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce message, merci de le détruire immédiatement et d'avertir l'expéditeur.




Le 15/06/2011 à 03:55, qingquan luo a écrit :

Hi All,

  I use freeswitch to bridge one incoming call to other target phone number.
  I use bypass_media mode.
  So the rtp is not go through the freeswitch,
  By I notice that When LegB reply 183 or 200 SDP message. Freeswitch
change it 2833 telephone-event payload type. and forwarding the message to
caller. This make the caller use wrong dtmf payload type to send dtmf

  What wrong with that?  How can fix it?
  Any information or help is welcome.

information with "sofia global siptrace on"

Thanks


Best Regards


Qingquan

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