Hello Naveen,

UAS: 

can send a 487 Request Terminated to the INVITE Request, if it could not 
generate a final response, within the time (in seconds ) mentioned in 
the Expires header of the INVITE request.

Proxy:
can send CANCEL's out, when the Expires header value timer fires !

It is clearly mentioned in the RFC 3261, too !

Cheers,
Simith

 
  ----- Original Message ----- 
  From: Prabhakaran, Manikantan 
  To: varun ; [email protected] 
  Sent: Wednesday, April 25, 2007 3:06 PM
  Subject: Re: [Sip-implementors] Expires header in Invite



  A UAC, may decide to send a CANCEL if no final response is received
  within the time specified in Expires header. 

  -----Original Message-----
  From: [EMAIL PROTECTED]
  [mailto:[EMAIL PROTECTED] On Behalf Of varun
  Sent: Wednesday, April 25, 2007 2:48 PM
  To: [email protected]
  Subject: [Sip-implementors] Expires header in Invite

  Hi,
  What is the use of expires header field in an Invite request? Will the
  request get timed out after this time in case no final response is
  received?

  Thanks
  Naveen

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