[SIPForum-discussion] INVITE without SDP(offer)

[M. Ranganathan]

On Fri, Oct 17, 2008 at 4:53 AM, dileepravindran
<dileepravindran at tataelxsi.co.in> wrote:
> 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.

If G711 was one of the codecs in the offer (not ncessarily the primary
one), then your phone should be prepared to stream media using that
codec when it gets the ACK. If it was not, then the other end shold
reply ACK with no codecs - to which the phone should send BYE.

Note that G711 support is mandatory.



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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-- 
M. Ranganathan