[SIPForum-discussion] INVITE without SDP(offer)

[Herve Jourdain]

Hi,

 

I guess that if the G.729 codec you specified in your SDP is not the only
codec listed, and if you also listed G.711 µLaw, then you should change your
local codec to G.711 µLaw.

If you only want to support 1 codec, then you should have only one present
in your SDP. If not, the other party can dynamically switch to any of your
supported codecs during the call – fortunately, not all SIP devices do that,
but they can – without any associated signalling.

 

Regards,

 

Herve

 

  _____  

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of dileepravindran
Sent: vendredi 17 octobre 2008 10:54
To: discussion at sipforum.org
Subject: [SIPForum-discussion] INVITE without SDP(offer)

 

Hi all,

I am facing a very strange situation. The gateway that I am using for PSTN
calls sends me an initial INVITE without SDP. I send out an offer in my 200
OK response with G.729 as the primary codec. The answer that I get in ACK
from the gateway contains G.711 u law as the primary codec. What should my
phone do, should it drop the call or establish a call by changing my codec
to G.711 mu law.

 

My phone is currently rejecting the call with a BYE.

 

Please help me out..

 

 

Thanks in advance

Dileep

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