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

[Devanand Kumar]

Hi Lokesh,

 

Transaction:-

 

Via: SIP/2.0/UDP 10.255.1.30:5060;branch=z9hG4bK3763983732-38
transaction number

 

You can see branch- id in the via header that is the transaction
number...

                since sip is a transaction protocol so it required
transaction number to send a request and get response for this
transaction.   

 

Dialog:-

 

From: sip:+165566611111 at 10.255.1.30:5060;tag=axes-alc;user=phone

To:
sip:+15053338888 at 10.255.0.168:5060;tag=alcUA_2242290126-17;user=phone

Call-ID: 11-11-11

 

A dialog represents a peer to peer SIP relationship between two user
agents which persists for some time.

So a dialog consists call-ID, remote tag and from tag.

Two type of dialog is here:-

 

Early Dialog:- A dialog established by a non final response.

  

Confirmed Dialog:- After getting 2xx response.

 

Session:-

 INVITE/200/ACK these methods are used to establish a session.

 

We can say a session has established when INVITE request is getting the
final response 2xx from UAS and UAC send ACK for that final response or
the media negotiation has happened between the UAC and UAS.

 

Thanks,

Devanand Kumar

 

________________________________

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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