Re: [Sip] Invite without offer

Your question is more appropriate for the SIP Implementers list methinks: sip-implementors at lists.cs.columbia.edu

(see https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors)

But anyway, yes there are situations where an Invite will contain no SDP, and you MUST support receiving such – many systems send such offerless Invites. But when you send Invites, I would strongly recommend you send it with an SDP offer unless it is actually technically impossible for you to do so, because many systems can’t handle receiving one without it and will simply fail your request.

-hadriel

From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of Aditya Sehgal
Sent: Tuesday, April 15, 2008 10:50 AM
To: sip at ietf.org
Subject: [Sip] Invite without offer

Hi all,
Is there any practical situation where in an Invite will contain no SDP.
Lets say A calls B.
My understanding (albeit limited) of the RFC makes me believe that 200 OK is sent out when B will pick up the phone. Now assuming, the Initial Invite contained no offer (and 100 rel is not supported),the first offer is then sent out at 200 OK .If the return ACK is either dropped in the IP cloud or is delayed, with no media established, the call is essentially useless.

So, is there any situation where it makes sense for a UE to send an Invite without an Offer.

Please correct me if my assumptions are wrong.

Thanks & Regards,
Aditya Sehgal

--
Don't take life too seriously....Nobody comes out alive anyway

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