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

[Dale R. Worley]

"Leviatan, Chava" <chava.leviatan at hpe.com> writes:
> 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 ?

It's probably not strictly standard, but I don't think it's outside of
the standard, either.  The second INVITE is semantically a duplicate of
the first INVITE.

Dale