[Asterisk-Users] Asterisk - Cisco 7960 - NAT

[Ryan Parlee]

We have 10 Cisco 7960 phones at our office and a single static IP.  Our
asterisk server sits in the colo facility at our ISP.  All phones are setup
with a unique voip_control_port and they are all able to dial out.  However,
my phone is the only one that can receive a call.

Every phone in the office can dial my extension and it will ring.   I can
call our main number and my phone will ring.  But no other phone will ring!
I get a fastbusy signal when trying to dial someone else's extension from my
phone or from another phone.

Can someone please help!

Thanks, Ryan