We have the following setup:
Pix 500 series firewall running OS 5.3. We have 1 to 1 nat set up. Behind this firewall we have dlink lingo voip gateway.
The dlink lingo voip gateway has an external address of 192.168.5.5. We have a one to one nat set up where 64.xxx.xxx.xxx is the 192.168.5.5 address from the outside.
From a host outside of this network, we have ping the address, we can even access the web interface of the dlink voip gateway using the real ip address 64.xxx.xxx.xxx
We have set up a fixup for voip port 5060 and have set a access list range for ports 10000 - 20000
Here is the wierd part, the user can receive voip calls on the gateway/voip phone, but when we try to dial out, we get dialtone, but everytime we dial, we get a fast busy all of the time.
Is this a pix firewall issue, or voip phone issue? The really odd part is that we can take this dlink voip gateway and stick it on a dsl or cable configuration(not behind the pix firewall) and everything works like normal.
The dlink gateway even states that it's connected to the voip network.
Anybody have a clue where I can start looking to fix this problem?
-Brent