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

[Olle E. Johansson]

16 apr 2012 kl. 15:31 skrev Matthew Jordan:

> It's not a bug - decrementing the CSeq header field value is directly in
> violation of RFC 3261.  From section 22.2:
> 
>   When a UAC resubmits a request with its credentials after receiving a
>   401 (Unauthorized) or 407 (Proxy Authentication Required) response,
>   it MUST increment the CSeq header field value as it would normally
>   when sending an updated request.

This only applies to the same dialog. The question here is if it is the 
same dialog. If it is, then the server indeed has a bug.

Check the Call-ID and the from tag of both requests.

/Olle
> ----- Original Message -----
>> From: "Benoit Panizzon" <benoit.panizzon at imp.ch>
>> To: asterisk-users at lists.digium.com
>> Sent: Monday, April 16, 2012 7:12:09 AM
>> Subject: [asterisk-users] Invite + decreasing sequence number => 500 Error?
>> 
>> 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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