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

[Sriram Subramanian]

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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