[SIPForum-discussion] Re-Invite without SDP, No Audio Issue

[Paul Kyzivat]

On 9/26/17 5:40 PM, Harshal Patel wrote:
> Hello Members,
> 
> We have a quick question for our propriety SIP IVR deployment with Avaya 
> 6.3.
> 
> Avaya sends "SIP IVR" a Re-Invite after Agent(Avaya) tries to connect to 
> "SIP IVR" for CSAT application. Meaning Agent is now connecting 
> "original caller" to IVR CSAT application.
> This Re-Invite does not have SDP.

The above is a bit unclear on the details. Can you give a call flow and 
show all the involved parties?

>  1. *Should the SIP IVR put the audio on hold ? because no SDP is present.

If you haven't already, start by reading rfc6337. That may answer your 
questions.

Whether to put audio on hold isn't really a protocol issue, it is more 
of an implementation choice. But I guess in this context it would be a 
really bad idea.

>  2. *Or Should the SIP IVR neglect the Re-INVITE and continue with the
>     call?*

You MUST NOT ignore the reinvite!!!

	Thanks,
	Paul

> 
> The issue is caller is not able to hear the CSAT survey.
> 
> We checked the RFC & it states:
> a UAC MAY send a re-INVITE with no session description, in which case 
> the first
> 
>     reliable non-failure response to the re-INVITE will contain the offer
>     (in this specification, that is a 2xx response).
> 
> 
> But we do not see anything in regards to audio.
> 
> 
> Appreciate if you can provide any link - that describes the path to approach in the above case.
> 
> 
> Thank you
> 
> Harshal
> 
> 
> 
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