Re: [Sip] Replies to ACK

[Jiri Kuthan <jiri@iptel.org>]

At 04:07 PM 12/19/2002, Jonathan Rosenberg wrote:
>Jiri has claimed that they are "harmless". 

I'm not sure I ever did. Never mind.

[...]

>This will cause the INVITE state machine to consider that response as 
>a response to the original INVITE (CSeq method is not needed in the matching process!). 

Is that some implicit assumption too? I read the following in spec,
section 17.1.3: "A response matches ... If the method parameter in the 
CSeq header field matches the method of the request that created the 
transaction." It does not mention any special case, in which method 
matching is not used. Which is IMHO correct.

>This will trigger an ACK retransmit, which triggers an ACK response, which triggers an ACK retransmit, etc. The result is a message storm.
>
>Thus, sending an ACK response is a BAD THING.
>
>Robert has already logged a bug against it.

Thanks -- I think explicitely declaring replies to ACKs as illegal
would add clarity. 

-Jiri  

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