[SIPForum-discussion] Difference between DIALOG, SESSION and TRANSACTION

[mishra.abhishek at wipro.com]

Hi Lokesh,
 
A transaction refers to a fundamental unit of message exchange. It
basically includes a request-response cycle.
 
 Dialog represents a peer-to-peer relationship between two user
agents.It is usually created through generation of "non-failure"
responses to request. e.g.
 
 
Example-1:
 
UAC                      UAS
  ---INVITE (a)--->
<--100 Trying (b)-----
<---200 OK (c)--------
 
---ACK (d)--------------->
 
 
<-----BYE(e)----------------
----200OK (f)------------------>
 
In the example 1, (a) to (c) are one transaction. (d) is second
transaction and (e)& (f) constitute third transaction. 
 
Together, these three transaction constitute one dialog
 
 
 
Example-2:
 
UAC                        UAS
      -----INVITE (g)----->
      <---100 Trying-(h)----
       <--486 Busy (i)------
       ---ACK (j)------------->
 
 
In the example-2, the messages from (g) to (j) constitute one
transaction. This is a "no-dialog" scenario.
 
 
 
A session refers to the exchange of media between two or more Endpoints.
Also, there can be dialogs without SIP sessions.
 
 
Hope that this helps.
 
thanks & regards
Abhishek
 
 
Abhishek Mishra
Wipro Tech
Tower-8, 1st Floor, C-wing
Electronics City Campus
Bangalore-560100
 
 
________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Lokesh Agrawal
Sent: Friday, August 17, 2007 5:29 PM
To: SIP
Subject: [SIPForum-discussion] Difference between DIALOG,SESSION and
TRANSACTION


Hi All,

Can Any one tell me difference between DIALOG, SESSION and TRANSACTION.
Please tell in detail with an example.


Thanks and Regards
Lokesh Agrawal



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