[SIPForum-discussion] HELP

[fråmedrëlay]

A calls to his voicemail system & listen the message left for A. A hears one message from his close friend B.

A -------Invite ------------ Voicemail system
A -------- 100 trying ------
A -------- 200k ---------------

A hears the message (Voicemail system)

Then A decides to outcall B, 

                                      Voicemail ---------------------------- B
A ------------------------------------------------------------------------------- B
Now voice path is estblished btw A and B

!st A listening to voicemail is Dialog 1 & A outcalling B is Dialog 2.
Hope its clear.

Ashish Umrani <ashish.umrani at gmail.com> wrote: I dont know if anybody answered to your satisfaction.  here is my attempt.  Mine is purely english based and less technical yet its the same that SIP has applied.


Assume that Ganesh wants to talk to Ashish and we have a proxy in between.  I am describing how will this complete process go through.
 
Ganesh will start talking to proxy (not knowing ashish's ip proxy, is the only way left to Ganesh for this purpose).
Ganesh tells proxy that he wants to talk to Ashish.
Proxy tells ganesh that "Hang on! let me see what I can do"
 
Proxy then tries to contact Ashish, stating that Ganesh wants to talk to Ashish (messages are sent to all known locations for Ashish)
Ashish says "Ok I am ready"

Proxy tells Ganesh, where about of Ashish
 Ganesh and Ashish both start talking

After 5 minutes if happy talk, Ashish says Bye and tells proxy that he is done with conversation.
Proxy then tell Ganesh that Ashish has ended conversation
The call ends
 

In the above mentioned scenario, the first three sentences represent a dialog between Ganesh and proxy.
Complete conversation between Ganesh and Proxy is the session between Ganesh and Proxy
Similarly next two sentences represent Dialog between Proxy and Ashish
 Complete conversation between Ashih and Proxy is another session

I am not 100% sure about transaction and wont like to misguide you.

Ashish




On Fri, May 16, 2008 at 1:39 AM, Ganesh Bhattathiri <ganesh_bhattathiri at persistent.co.in> wrote:
              Hi
   
  Can somebody tell me the difference between Dialog and session and transaction?
   
  First let me tell you what I thought it was.
   
  If there is a UAC and UAS, If UAC sends a request and gets a non-100 response back the whole process is knows as a dialog
  And from the point of first request to the ACK sent for BYE it is  a session. 
   
  Now if what I have said above is right then how would you differentiate a request sent outside the dialog? As in doesn't that also get a response back could that not be a non-100 response?
   
  Can Someone help me get this confusion cleared?
   
  Thanks again
   
  Ganesh
  
  
   
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Cheersp.sylvester |-------------------------------------------------------------------* mail me : prasanthsylvester at hotmail.com
       
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