[SIPForum-discussion] Why ACK is separate transaction for INVITE

[Retesh]

Hi

I think 1 of the reason is that ACK for 2xx can take a different network
path then INVITE or 2xx messages based on the contact and route set received
in 2xx and so it needs to be a separate transaction (different Via header
and branch parameters), which is not the case with ACK for non-2xx final
response.

Hope this helps.

Regards
Retesh
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