[SIPForum-discussion] Difference between UPDATE and Re-INVITE

[prasanna c]

If UAs support UPDATE, I would rather use UPDATE instead of Re-Invite for two reasons. One I don't have to place any body into the SIP message. Second, UPDATE transaction is much faster compared to re-invite.
  

Date: Thu, 1 Oct 2009 17:46:05 +0530
Subject: Re: [SIPForum-discussion] Difference between UPDATE and Re-INVITE
From: sriram.ngn at gmail.com
To: c_prasanna_c at hotmail.com
CC: yansb43 at gmail.com; discussion at sipforum.org

For session timers generally a REFRESH INVITE  mostly and not UPDATE as it is common that many sip stacks does not support UPDATE mechanism

A Refresh invite is slightly different from a Re-INVITE ,It does not change the Media capabilities and also if u see the O-Line in the SDP the Session ID and Session Version will not be incremented like in a Re-Invite.


Regards,
Sriram



On Wed, Sep 30, 2009 at 8:57 AM, prasanna c <c_prasanna_c at hotmail.com> wrote:






UPDATE need not exchange session descriptions, where as INVITE transaction always exchange the session descriptions. This makes UPDATE ideal for session timers implementation. 

Date: Tue, 29 Sep 2009 22:45:08 +0530

From: yansb43 at gmail.com
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Difference between UPDATE and Re-INVITE


Hi All,
 
Hope all of you are doing fine.
 
Here I am with a age old query.
 
Difference between UPDATE and Re-INVITE.
 
One basic difference is-----
 
Re-INVITE cant be sent before session is established.But UPDATE can be sent always.
 
Is there any other major difference?????
 
Thanks
 
  		 	   		  
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