Hi -

What is the RFC 3261 statement w.r.t. the following scenario:


UAC                UAS

 ---- INVITE (1) ---->

 <--- 401    (1) -----

 ---- ACK    (1) –X        ACK packet lost in transit

 ---- INVITE (2) ---->     (with Auth. credentials)

 What should the UAS do with INVITE (2) before it receives the ACK for the
1st transaction?

I'm assuming that INVITE (2) has incremented the CSeq, but it has the same
Call-ID and From tag as the INVITE (1).

I've heard two answers:



1) UAS sends 491 to UAC

2) UAS processes INVITE (2)



Which one is correct?

Thanks,

Mohsen
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