Hi,
According to 13.2.1, if the INVITE did not contain the initial offer,
the UAS can
make the offer only in a reliable non-failure message. Hence, the UAS
cannot make
the offer in an unreliable 18x.
Also, sending the response over TCP would not make it reliable, since it
is not
known/gauranteed that all intermediate hops also use TCP to send the
response
across.
Thanks and regards,
A. N. Gautham
Chauhan Bhavik-A20762 wrote:
Hi all,
I was exploring the possibility for the UPDATE to send the Answer,
As I haven't found any explicit restriction in RFC 3311.
I went through the older Thread
http://lists.cs.columbia.edu/pipermail/sip-implementors/2004-January/006017.
html
<http://lists.cs.columbia.edu/pipermail/sip-implementors/2004-January/006017
.html>
and came across following Qs which I found not clarified though.
1. Can UPDATE be used to send an answer SDP ?
Consider the following scenario:
- INVITE was sent without SDP
- 18x is received with Offer SDP
- There is no PRACK exchange because 18x does not contain a
Require:100rel header
Now can UPDATE be used to send answer SDP??
2. As per RFC 3311, UPDATE method should be used only if dialog is
established.
If INVITE/18x exchange happened without PRACK, can both ends treat
this as early dialog and feel free to use UPDATE ?
3. Is 18x send/recv over TCP considered reliable ?
In the following scenario:
- INVITE with offer sdp sent
- 18x over TCP with answer sdp recvd (No PRACK exchange happened)
Now can the caller/calleee use UPDATE ?
Can any body clarify the same?
Thanks in advance,
Bhavik Chauhan
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