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Community Fibre VoIP behind pfSense

Matt.Rowley.1990

Regular Member
Hello all,

I have a bit of a niche problem that I’m hoping you’ll be able to help me with.

I have community fibre (1 gig, no CGNAT) with their VOIP service. It uses a Grandstream HT-801 ATA device which connects to the phone via RJ11 and network via Ethernet. Nice and simple.

With the stock Community Fibre router (Linksys Velop) it works absolutely fine. Behind my pfSense router, it will only accept incoming calls but outbound do nothing; just a line open beep after 20 seconds of dialling a number. On an incoming call, audio works both ways and is crystal clear. No weird one way stuff going on. I have also tried the ATA on a Virgin Hub 4 and it works perfectly, so there’s no weird router/MAC address lock going on.

On pfSense, I feel like I have tried absolutely everything. I’ve tried manual NAT, allowing all UDP traffic to the Grandstream, I’ve tried traditional SIP ports on port forwarding. I’ve even tried disabling the firewall and even that does absolutely nothing to help. I’ve tried packet capture on my pfSense box and cannot see anything unusual that wouldn’t be allowed through by my overly generous testing configuration. I’ve even removed all devices and plugged directly into the LAN port on the pfSense box. No change.

Unfortunately the Grandstream ATA is pre-provisioned and remotely managed by community fibre, so I can’t see the configuration. That being said, if it works fine on a big standard router from a different provider, it can’t be doing anything too special.

I’m really running out of ideas here, short of trying a fresh pfSense install or trying OPNSense. Before anyone says to use the community fibre gear and be done with it; I use a lot of the in-built pfSense features and cannot do without them now.

Would really appreciate the hive mind’s help!

Matt
 

kommando828

ULTIMATE Member
On my Draytek I have

VoIP Prioritization
Enable the First Priority for VoIP SIP/RTP:


which takes the UDP port number my ATA uses. It's in the QOS section, pfsense may have a similar setting.
 
Last edited:

Pheasant

ULTIMATE Member
Not much help, but reads like a SIP registration issue through your pfSense box.

The standard SIP registration period may be too long for the pFsense box... see "Set Conservative state table optimization" below:


Shame you haven't got another indy VoiP test account (like Sipgate) to test with. If you can replicate the issue then you know its common and not just a quirk of their VoIP implementation.
 

Matt.Rowley.1990

Regular Member
Not much help, but reads like a SIP registration issue through your pfSense box.

The standard SIP registration period may be too long for the pFsense box... see "Set Conservative state table optimization" below:


Shame you haven't got another indy VoiP test account (like Sipgate) to test with. If you can replicate the issue then you know its common and not just a quirk of their VoIP implementation.
Indeed, it does sound like that. Strange that inbound calls are absolutely fine!

I wish I could say I was seeing that knowledge article for the first time. I think I’ve read it 100 times and confirmed over and over.

I’m going to try a fresh Pfsense install tomorrow and if that fails, something like Sophos UTM.
 

Pheasant

ULTIMATE Member
Without being able to see what's going on under the covers of the Grandstream box, you're a bit one hand tied behind the back when it comes to diagnosis unfortunately.
 

Matt.Rowley.1990

Regular Member
Without being able to see what's going on under the covers of the Grandstream box, you're a bit one hand tied behind the back when it comes to diagnosis unfortunately.
I know, very frustrating!

I’ll keep this thread updated for anyone else who may end up using community fibre voip behind pfSense.
 

Matt.Rowley.1990

Regular Member
Quick update:

I tried it on a relative’s Virgin Media connected pfSense box with absolutely no configuration and it worked right away.

I can only assume there is some stale configuration somewhere causing an issue. I’ll do a fresh install tomorrow to see if this resolves the problem.
 

Matt.Rowley.1990

Regular Member
Quick update:

I tried it on a relative’s Virgin Media connected pfSense box with absolutely no configuration and it worked right away.

I can only assume there is some stale configuration somewhere causing an issue. I’ll do a fresh install tomorrow to see if this resolves the problem.
Fresh install of pfSense appears to have rectified the issue. Who knows what it was but nice to know that there are no special NAT rules needed out of the box!
 

Phil2021

Regular Member
Fresh install of pfSense appears to have rectified the issue. Who knows what it was but nice to know that there are no special NAT rules needed out of the box!
Might be too late, but could be worth comparing the XML configuration file from the non-working pfSense to the freshly installed one, it may indicate what the different setting was for future reference.
 

Matt.Rowley.1990

Regular Member
Might be too late, but could be worth comparing the XML configuration file from the non-working pfSense to the freshly installed one, it may indicate what the different setting was for future reference.
I'll give it a go. For what it's worth, I did a fresh install with the old config and the issue came back, so it is in there somewhere!
 
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