[SIPForum-discussion] Diff between transaction and Dialog in SIP

[chandrasekhara.madduri at wipro.com]

Hi,
 
Transaction is a fundamental unit of message exchange.It refers a requst
response cycle.
 
A dialogue is a peer-peer relationship between two user agents and it is
created by a non-failure response to a request.Number of transactions
constitue a dialogue and it depends upon the scenario.
 
Example: 
 
A invites B and B accepts it and session is established between A and B.
   
       Invite (1)
A ------------------> B                       1 to 3 is Transaction 1
   100 Trying (2)         
  <------------------
    200 OK (3)                     
  <-------------------
         ACK (4)                             4 is transaction 2  
   --------------------->
       BYE  (5)
   <--------------------
                                                  5 to 6 is transaction
3
      200 OK  (6)
   ---------------------->                        
 
Transactions 1,2,3 constitute a non-failure dialogue.
 
Please let me know if you would like to have further explanation.
 
Regards,
Chandra


________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Sathya
Sent: Wednesday, February 17, 2010 12:26 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Diff between transaction and Dialog in
SIP


Hi All,

 Kindly explain me the diff between transaction and Dialog in SIP.

Sathya.



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