[Asterisk-Users] Firewall traversal anomalies - AJA

[Andrew Aken]

I'm trying to setup a Cisco ATA 186 which has a public IP address but 
sits behind a firewall and connects to an Asterisk server with a NAT IP 
address sitting behind a BSD firewall. The Cisco registers with the 
Asterisk server without any problems, and I can place calls without any 
problems and the phone on the other end rings correctly. However, I 
cannot hear anything through the Cisco after the connection is made. 
Where should I begin looking for the problem?

This is the sip.conf entry for the Cisco:
[6184341501]
callerid="GlobalEyes" <6184341501>
canreinvite=no
context=from-internal
dtmfmode=rfc2833
host=dynamic
mailbox=xxxxx
nat=yes
port=5060
secret=xxx
type=friend
username=xxxxx
allow=all