RFC 3261 - 8.1.1.6 page 39 states that Max-Forwards header must be 
inserted by UACs in all generated requests.

I suppose all requests include also CANCEL and ACK, but I've noticed 
that some clients do not insert Max-Forwards haeder in ACK and CANCEL 
requests.
So I would like to know if these kind of requests must have this header 
or not, and if not if there is a hint in RFC 3261.

The only practical solution I see is to disable checking the presence of 
Max-Forwards header in ACK and CANCEL requests in our SIP stack.

Thanks.
-- 

Marco Ambu
R&D Software Engineering
Abbeynet S.p.A. - www.abbeynet.com <http://www.abbeynet.com>

phone: +39 070 2339331

<http://www.marco_ambu.sitofono.it>


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