[SIPForum-discussion] SIP update & Re-invite

[Chinmaya Samal]

Hi Murali,

Please have a look into the below for your answer:

A re-INVITE generated to refresh the session is a normal re-INVITE,   and an UPDATE generated to refresh a session is a normal UPDATE.  If a UAC knows that its peer supports the UPDATE method, it is RECOMMENDED that UPDATE be used instead of a re-INVITE.  A UA can make this determination if it has seen an Allow header field from its peer with the value 'UPDATE', or through a mid-dialog OPTIONS   request.  It is RECOMMENDED that the UPDATE request not contain an offer [4], but a re-INVITE SHOULD contain one, even if the details of the session have not changed.  In that case, the offer MUST indicate  that it has not changed.  In the case of SDP, this is accomplished by including the same value for the origin field as did previous SDP messages to its peer.  The same is true for an answer exchanged as a result of a session refresh request; if it has not changed, that MUST be indicated

Thanks & Regards,
Chinmaya Samal
EXFO|NetHawk India

On Tue, 10 Aug 2010 21:55:09 +0530  wrote
>Hi,
 
  Can anyone explain SIP Update and re-invite ? 
 
Thanks in advance.
 
Regards,
Murali Shankar.E
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