[asterisk-users] Calls hang up after 20 seconds

[SIP]

Alex Balashov wrote:
> SIP wrote:
>
>
>   
> What is your citation for this qualification?  RFC 3261 does not seem to 
> me to say that, as in 13.1:
>
>     Because of the protracted amount of time it can take to receive final
>     responses to INVITE, the reliability mechanisms for INVITE
>     transactions differ from those of other requests (like OPTIONS).
>     Once it receives a final response, the UAC needs to send an ACK for
>     every final response it receives.
>
> Or 13.2.2.4 ("2xx Responses"):
>
>     The UAC core MUST generate an ACK request for each 2xx received from
>     the transaction layer.
>
>
>   
I think, perhaps, I am misremembering the difference between sec. 17
ACKs and sec. 13 ACKs.  I'm pretty sure one has somewhat less stringent
requirements when sending an ACK from a TU (which a client would be, and
Asterisk is, since it's not a transactionless server).

I vaguely remember the language being softer in its requirements (which
is where the initial confusion on the Implementors list arose when we
were interpreting it).

N.