________________________________________
From: [email protected] 
[[email protected]] On Behalf Of Michael Scheidell 
[[email protected]]

almost exactly 5 min.

Two different firewalls, one sonicwall, with all the SIP helpers turned off, 
the other, a pfsense firewall that uses Tony's templates.
[...]
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(That's not a very clear error report.)

In almost all cases when audio is properly established and then later fails, 
some firewall or NAT is not doing the right thing.

One general piece of advice is to turn off any SIP ALG (Application-Level 
Gateway) processing -- many firewalls/NATs attempt to help with SIP, but just 
cause problems.  (sipXecs's NAT support is quite robust, if it is configured 
properly.)

The only general way to track this sort of thing down is to do a network trace 
on each segment of the network between the originating and destination ends and 
see which firewall/NAT loses the RTP packets.

Dale
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