[asterisk-users] Invite + decreasing sequence number => 500 Error?

[Benoit Panizzon]

Hi out there

We have a strange Problem here with invites.

We observe this SIP conversation.

C3 PBX <-> Asterisk

Case 1. Sequence Numer always increasing:

=> Invite
<= 401 Unauthenticated
=> Invite+auth with sequence number > previous Invite.
<= 100 Trying etc. Works OK.

Case 2. Sequence Number decreasing.

=> Invite
<= 401 Unauthenticated
=> Invite+auth with sequence number < previous Invite.
<= 500 ERROR

I was browsing the SIP rfc and I cannot find any clue if in this case the 
sequence numbers must be increasing (the C3 PBX is wrong) or if I have sumbled 
over an asterisk bug.

Is there anyone who knows?

Benoit Panizzon
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