[SIPForum-discussion] Response messages & Protocol

[harini.dhanasekaran at wipro.com]

Hi Vijay,
 
Here is the ans for ur first question: diff between 486 and 600 response...
 
Suppose if user A is trying to call user B, then 486 response message is sent by user B in the following situation:
   If user B's end system was contacted successfully, but the user B is currently not willing or busy or unable   to take additional calls at this end system.
 
600 response message is sent by user B during the following situation:
   The user B could be available elsewhere, such as through a voice mail service (if user B has registered for it). 600 (Busy Everywhere) response message is sent if the client knows that no other end system(such as voice mail service or call forward to another end system service) will be able to accept this call.
 
otherwise 486 response message is sent...
 
in both the cases, user A would hear busy tone on his/her end system...
 
for the call flows refer:  http://www.tech-invite.com/Ti-sip-service-8.html 
 
Thank you,
Regards,
Harini Dhanasekaran.
 
________________________________

From: discussion-bounces at sipforum.org on behalf of Vijay T
Sent: Sat 9/1/2007 11:37 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Response messages & Protocol


Dear ALL
     1.What is the difference between 486-Busy Here and 600-Busy Everywhere Response messages....Please tell me some examples..

     2.In SIP call flow when TCP come into picture and when it'll be changed from UDP to TCP??explain me with some examples...

Thanks & Regards
Vijay


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