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

[mishra.abhishek at wipro.com]

Hi Lokesh
 
Do you wanna say INVITE is creating a dialog in this example or Dialog
is created after 200 OK response only ??????

 
<AM>  Dialogs are created through non-failure responses to the requests
with specific methods Please see Example-2 as well.
 
  If there is no media exchange there should not be session  Am I right
???? 

<AM> There can be dialogs without sessions
 
Hope that this helps
 
 
thanks & regards
Abhishek
 
 
Abhishek Mishra
Wipro Tech
Tower-8, 1st Floor, C-wing
Electronics City Campus
Bangalore-560100


________________________________

From: Lokesh Agrawal [mailto:lokesh.agrawal at gmail.com] 
Sent: Friday, August 17, 2007 6:33 PM
To: Abhishek Mishra (WT01 - TES-Enterprise Networks)
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Difference between DIALOG,SESSION and
TRANSACTION


Hi Abhishek,

Thanks for the response. Now I am clear about transaction. I  have 1
query inline regarding Dialog.


On 8/17/07, mishra.abhishek at wipro.com <mishra.abhishek at wipro.com> wrote:


	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
	 
	Do you wanna say INVITE is creating a dialog in this example or
Dialog is created after 200 OK response only ??????
	
	 
	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.


      If there is no media exchange there should not be session  Am I
right ???? 



	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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