Grandstream HT812 2 FXS Analog Telephone Adapter VoIP FAX Gateway WAN LAN

After few hours in working, not getting incoming calls

Bought as I'm a zen.co.uk customer, and have UniFi throughout the house (I don't use the Fritzbox). With the BT/UK "digital voice" switchover in full-swing, I wanted a means to keep our old land line alive. This worked perfectly. Configuration hasn't been utterly straight-forward, but I've finally found the following settings work (for Zen customers): - Ensure your NAT/firewall is forwarding the required ports through to the Grandstream (5060/UDP from 212.23.7.228, and 20000-30000/UDP from 62.3.88.0/28 and 62.3.88.16/28) - Primary SIP server: voip.zen.co.uk - Secondary SIP server: voip2.zen.co.uk - Prefer Primary SIP server: No - Outbound proxy: Blank/None - Allow DHCP Option 120: No - SIP Transport: UDP - NAT traversal: No - DNS Mode: A Record - DNS SRV: No - Fallback Timer: 60 - Use Request Routing ID in SIP INVITE Header: No - Sip Registration: Yes - Outgoing Call without Registration: Yes - Register Expiration: 5 - Enable SIP OPTIONS/NOTIFY keep alive: No - Local SIP port: 5060 - Local RTP port: 5004 - Random SIP port: No - Random RTP port: No - Enable RTCP: Yes - Hold Target Before Refer: Yes - Refer-To Use Target: No - Remove OBP: No - Support SIP Instance ID: Yes - Validate Incoming SIP Message: No - Use Privacy Header: No - Use P-Preferred-Identity Header: Yes - Use P-Access-Network-Info Header: Yes - Use P-Emergency-Info Header: Yes - Use P-Asserted-Identity Header: No - SIP REGISTER Contact Header Uses: LAN - Caller ID Fetch Order: Auto - DTMF: RFC2833 - SLIC: UK - Caller ID Scheme: SIN 227 - Dial Plan: (You may want to customise) ... { 999 | 10[015] | 11[129] | 11[68]xx | 1[45]7[1-2] | <0=44>8001111 | <0=44>845464x | <0=44>[1235789]xxxxxxxxx | <=441638>23456789]xxxxx | 1410[1235789]xxxxxxxxx | x+ }

Although landlines are largely replaced with cell phones, you may have a reason to hold onto an old number. This was the case for us having owned a line for many years, but the rising costs had become unreasonable ($45/mo), just to keep a line that rarely gets used. I began looking at alternatives, and two stood out: give up the line entirely, or port the number to a VoIP provider. Some of you might say to port the number to a cell plan, but even $15 per month on a prepaid plan would feel wasteful. So, before ditching the line, I looked into VoIP, which honestly is a bit confusing. Some providers sell hardware/devices and bundle the service with that, others use stand-alone devices. I looked into the bundled service + device route first but those seem to have really bad customer service or quality of service reviews. Their pricing can also be quite deceptive on what you would actually pay. After that I saw a few recommendations for a VoIP provider based out of Canada as having great pricing and works with a variety of stand-alone devices like this Grandstream. I went this route and am very pleased with the result. For starters, my family can’t even tell anything changed. After a few days my landline number ported successfully to the new provider. Incoming and outgoing calls work just like they did before, and the sound quality seems the same. The Grandstream device itself works great. I am not using this as a router, I just plug it into an open LAN port on my network, and then run a line to my existing cordless home phone. It is small, doesn’t get very warm, and isn’t obnoxious with its indicator lights. Programming the device to connect with the VoIP provider did require following a guide, and the UI isn’t the best looking but gets the job done. The good thing is once you get it connected and working, you’ll probably never need to touch it again. Opportunities for improvement - Updating to the latest firmware is confusing – why is the wrong update URL set at the factory? I was able to update after finding instructions online. Also, the WebUI feels like a throwback to setting up an old router from the 90s.

Lo probé con Megacable conectando el módem a modo puente con este dispositivo usando la VLAN 559 y funciona de maravilla. Es importante que la cuenta SIP se puede tener activa en un dispositivo a la vez.

Just been fitted. Very happy. Great idea if you don't want a normal house telephone line. Works great with Starlink.

Just works. Purchased to replace a PAP2T that wouldn't ring the bell on a rotary phone.