[asterisk-users] Calls hang up after 20 seconds

Kevin P. Fleming kpfleming at digium.com
Mon Oct 19 07:03:53 CDT 2009


SIP wrote:

> In an ideal world, when Asterisk sent an ACK, whatever server/client it
> was connected to would respond accordingly. It is, however, not an ideal
> world, so this doesn't always happen.

This is not correct; there are no responses to SIP ACK messages. In
addition. ACK messages are *required* for proper SIP operation; lack of
an ACK to a response from Asterisk absolutely requires that Asterisk
assume that either the response was never delivered to the requester, or
that that requester has stopped responding. In either case, the SIP
dialog/transaction in question must be terminated, because it is no
longer in a determinate state.

If the SIP network does not route ACK responses properly, it is broken.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kpfleming at digium.com
Check us out at www.digium.com & www.asterisk.org



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