Title: Message
Hi Nagaraj
 
Via header is inserted by Proxy to indicate that the sip messages should go through it and Contact header imples the actualt Contact address of the UAC.
So in your case the softphone 'A' contains proxy's sip url in Via and its contact url in Contact header.
 
e.g  INVITE sip: [EMAIL PROTECTED] SIP/2.0
      Via: sip:[EMAIL PROTECTED];branch=....
      From: .................................
      To: [EMAIL PROTECTED];
      .................
      Contact: sip:[EMAIL PROTECTED]
 
Regards
Ranjit
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nagaraj S
Sent: Friday, June 25, 2004 2:07 PM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] Doubt in handling via ....

Hi ,
   I have a  doubt in handling "via and contact" header fields,
 
   AS per the RFC  3261,  "Via header field tells other elements where to send the
   response and  the Contact header field tells
  other elements where to send  future requests."
 
  If a softphone 'A' sends a INVITE message  with a "via header field containing the IP adress of
  some other softphone say 'B' ,  then  the response for this INVITE  will be sent to 'B' or not ?.
 
----
Rgds
Nagaraj S
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