Re: [OpenSIPStack] Ringing with SDP and early media

[Joegen E. B. <jb...@so...>]

jf...@id... wrote:
> Hi guys,
>
> Call flow: PSTN going to SIP Gateway
>
> When interfacing with PSTN, they are waiting for ringing with sdp for
> early media,


If your SIP Gateway does not produce 183 Progress with SDP, chances are 
it isn't capable of sending ring back.


>  my question is it the server responsibility to send the sdp
> in ringing 


By server, do you mean OpenSBC or the SIP Gateway?   If you mean 
OpenSBC, then its not OpenSBC's resposnsibility.  If you meant the SIP 
Gateway, then the answer is it depends.    If the SIP Gateway has a 
capability to send  ring back in  the audio path and its not sending 
early media via 183, then there's a fault somewhere.  Probably a 
configuration issue.

or is it the sip client?


By client you mean the caller?  Since when did a caller produce a ring?

Or by client you mean the callee, then yes.


>  or should I delay the sending of
> ringing after the 200 OK with sdp of sip client?
>
>   

Bad idea.   What will you achieved by delaying it?   Or are you saying 
the PSTN GW drops the call if it gets 180 without SDP?



> Regards,
> Julian
>
>
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