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-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu 
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Amanpreet 
Singh
Sent: Thursday, March 28, 2024 10:04 AM
To: sip-implementors <sip-implementors@lists.cs.columbia.edu>
Cc: Sandesh Gole <sandesh.go...@gmail.com>
Subject: [Sip-implementors] Call route advance standard


Hello All,

I'm looking to see if there is any RFC defining the standard around route 
advance/ re-routing of calls to the next available route based on the SIP 
failure response.

Looked into SIP Peering RFC6271 and RFC5486, however it doesn't cover the route 
advance requirements.

To be specific, we have SIP trunks with a provider, when a call fails on the 
first trunk with SIP 50X UAC is doing route advance to the next trunk with that 
provider as per priority. UAC is generating a new call-id in the INVITE for 
call to the second trunk; however the peer expects the INVITE with the same 
call-id.

Seeking your help for RFC to refer to conclude this, thanks in advance.


Thanks,
Amanpreet Singh.
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