RE: [Sip-implementors] Some Questions on use of UPDATE method

ranjit.avasarala Tue, 27 Jan 2004 21:45:11 -0800

Title: Message

I don't think u can send UPDATE to answer a INVITE. UPDATE is used to change session / media parameters after INVITE/200 OK.

Ranjit
Ph: 8520408/16 extn: 2173

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kasammiya Patil
Sent: Tuesday, January 27, 2004 8:36 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: [Sip-implementors] Some Questions on use of UPDATE method

Hi,

I have couple of questions regarding the use of UPDATE method.

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 ?

Appreciate any responses.
Thanks,
Kasam

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RE: [Sip-implementors] Some Questions on use of UPDATE method

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