Showing results for 
Search instead for 
Did you mean: 

Can't use phone from outside of firewall- RV320 - FreePBX



I have a FreePBX VOIP system that works fine except that I can't use a VOIP app on my Iphone from outside the firewall (It works fine if I use it inside the firewall).
I can hear the other person but they can't hear me. 

The router and firewall is a Cisco RV320.

I have set IP & MAC Binding for the FreePBX to
I have forwarded port 5060 and 10.000-20.000 to
On the Firewall I have opened port 5060 and 10.000 - 20.000 to

I've tried enable and disable SPI and SIP alg

Any one have any idea of what can be wrong or if I have forgoten something!?

I'm not sure where to post this, I hope it came write!

Have a greate day,

5 Replies 5

Simon Brooks

Sounds like an inspection issue. Try opening the firewall up both ways temporarily to see if it works.  If it does then trim down the acl both ways.


Thank you for the reply!

I've tried to disable the firewall but it didn't help.

Any other suggestion?


Does the VOIP server know to route the traffic back to the firewall for the public IP the client will be shown as?

Maybe source NAT the traffic of the client to the inside IP address?

Hi! That shouldn't be an issue, it worked fine before installing the Cisco RV320 router/firewall

I really appreciate the help and suggestions!

Have a good day!

Hi again!

Cisco have released a new firmware and it solved half the problem :)

Now I can answer all incoming calls on my Iphone without any problem. If I place an outgoing call, I can hear the other person but he can't here me.

Do you have any suggestions?

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers