[Asterisk-Users] Attempting native bridge .......

[Brian Weaver]

I have two fo the Sipura-2000 boxes, one at a friends house, one
here. It used to be working but now we are not getting any audio when
the call is picked up. 

I'm seeing this message when he answer the phone.

-- Attempting native bridge of SIP/2204-2b1b and SIP/2203-783a

As far as I can tell, it shouldn't be doing this because I have

canreinvite=no

in the sip.conf for these extensions since we are behind NAT firewalls
and the two Sipura boxes cannot talk directly to each other. 

What am I missing?