[SIPForum-discussion] URL and URI,what's the difference;

[vivek krishna]

Hello Wangran,
           The CALL ID which is generated by the
client when it creates a transaction and the value
cannot be controlled by a  server.In real world there
will be many requests to server and there is a chance
that two CALL ID's from different clients can be same
as also the case with Request URI.

So that is the reason that we have a combination of
CALLID+from tag+TO tag. As to TAG will eb created by
the server it will be unique and thus you can uniquely
identify a session with a combination of these
parameters.

Regards,
vivek krishna 
--- wangran <wang.ran at byd.com.cn> wrote:

> Dear,all
> 	Why SIP use call leg to identify a call,just use
> callee's URI or
> just use Call-ID will also be OK, I think. So
> somebody who familiar with
> this,can share some idea,please!
> 
> Best of Regards,
>  
> Wangran
>  
>  
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