Hello,
I’m really new to VOIP in general, so please assume I know nothing.
Here is the page in question:
https://support.flowroute.com/859507-Set-firewall-for-direct-media-delivery
I have a GrandStream HandyTone 801 (HT801).
My router/firewall is pfSense.
The HT801 is on a subnet that only has WAN access. If I plug a laptop into that subnet it can browse the web just fine, so the subnet is at least mostly sane.
Following the flowroute documentation I have done the following:
- Static port NAT mapping for the HT801 for ports 5060 (SIP) and 5004 (RTP).
- Port Forwarded both those ports to the HT801.
The Problem:
One way audio.
- If I make a call from the HT801 the other side rings, but I can’t hear the ringback
- I can see tons of outgoing RTP data on port 5004
- No incoming UDP packets at all <— probably the root cause of the problem
I assume I haven’t port forwarded the required RTP ports, but I can’t find any documentation as to what they are.
I called their support line (very friendly/helpful) and they said I should open (port forward?) all UDP traffic to the HT801. That sounds like a bad idea to me, but I can’t quite put on my finger on why. Security-wise it’s on an isolated network, so maybe that’s not terrible, but wouldn’t it break all other UDP traffic coming in for other devices?
What is a home user to do? I don’t have a dedicated public IP for this ATA.
thanks