FreePBX / Stormshield / Firewall issues

[klawd]

Hello

 

We have recently setup a FreePBX server in house to replace our aging old PBX system, but we are having a few issues.

It is the common one way audio problem.

 

Currently our setup is running through a backup FFTC line with a low spec router, with a few ports forward, all very simple, and everything works as it should. No audio issues, very clear. No problems at all when using this connection.

 

However, our problems start when we try to use our Leased line with our higher spec firewall. We get a range of issues, including:

 

1. Can hear incoming calls OK, no problems with two way audio

2. Can dial out and hear the other end, but they cant hear us

3. Can dial out, but can't hear the other end, but they can hear us

 

...and a mixture of 2 and 3. It seems very inconsistent. All googling points towards "NAT" related issues.

 

As it works on our FFTC but not our leased line, it seems the problem is obviously the way we have our firewall rules configured.

I have tried numerous combinations of opening ports, but nothing seems to solve all the problems in one go.

 

The firewall Appliance is a Stormshield SN510. We have setup a seperate VLAN and a seperate IP range on the interface. The FreePBX uses this as the default gateway.

 

We are using voiptalk/TeleAppliant as the SIP trunk provider. They have told us we have to open a range of ports

5060-5065, 10000-20000, which we have done.

 

I am tearing my hair out here, for what seems like a very simple issue.

 

I am wondering if there is anyone with experience of configuring FreePBX and or/a stormshield might be able to help us resolve this issue.

 

Thank you

[speakercon]

Did you get to the bottom of this?

 

We had a very similar problem and it turned out to be the 'SIP Session Helper' on our firewall causing the problem, once it was disabled it worked fine.

[SchoolsBroadband]

Yes highly recommend you turn off SIP alg on your firewall as this can often break SIP