[SIPForum-discussion] Re-use of call-Id

[My Gmail]

If the packet is retransmitted we need to check if branch Id is also same or different.
If branch id is different then it's a different transaction.

Thanks and Regards 
Dheeraj Kumar 

Sent from iPhone

> On 04-Jan-2017, at 10:04 PM, Leviatan, Chava <chava.leviatan at hpe.com> wrote:
> 
> Hi ,
>  
> I faced the following scenario:
>  
> 1.      UAC sends INVITE
> 2.      UAC receives 100 Trying
> 3.      UAC Receives 503
> 4.      UAC sends ACK
>  
> Immediately  after that ,  the  UAC sends the same INVITE , i.e. same call-id , same from tag ,  same CSEQ . It is sent from a different IP , and to a different IP . I.e. if 1-4 were sent from IP A to IP B , then repeated 1 -4 is sent from IP C to IP D .
>  
> The whole episode ( INVITE -> ACK ) is less than 300 millis , i.e. less than T1
>  
> Is that standard ?
>  
> When I look at the INVITE transaction diagram on 17.1.1.2 , the client should get into terminate state after Timer D fires .
> On the other hand , this INVITE should not  be re-transmitted ( as part of the transaction ) as it received 100 Trying ( and 503 )
>  
> Appreciate any views you have on that
>  
> Thanks ,
> Chava 
>  
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