Yealink W70B Not Provisioning after WAN outage

[sevenvoip]

We have a customer that has a W70B with two handsets. Whenever there is a brief internet outage, the W70B does NOT re-register with our 3CX server via STUN. A quick reboot of the W70B always gets it back up and working, but this is becoming cumbersome. I emailed Yealink support about it, but I got nothing back. I've also got the W70B running on the latest firmware.

 

[JohnS_3CX]

Hi @sevenvoip

This is (unfortunately) the nature of STUN. There won't be many things you can do about it, and I would argue that the time you will end up wasting chasing down STUN issues would best be used installing an SBC instead.

It's possible to run the SBC on a Raspberry Pi 4B, Windows or Debian machines / VMs, and now it's also available on select phone models too which can act both as a phone and an SBC for themself and for others. We invested the time to create the 3CX SBC to save you the time and effort of trying to solve intermittent STUN issues, and we highly recommend you make use it. If it serves as any indication for you, we do not support STUN on our own 3CX Hosted and StartUP products and have the SBC as a hard requirement.

See available Router phones here in case you already have one on site you can use:
https://www.3cx.com/sip-phones/








Alternatively if you still prefer to use STUN, make sure your W70 has:

1. The latest firmware
2. A static IP set
3. Port forwards for its SIP port
4. Port forwards for its RTP Range
5. You've disabled SIP-ALG on your firewall
6. You've disabled SIP-ALG on the ISP's CPE

Unfortunately this is no guarantee it will work, but you will have the best chance at least.

 

[AWS2P]

Why not using an SBC instead of STUN ?

 

[sevenvoip]

We do use SBC's at most locations, but this location ONLY has these 2 cordless phones. Didn't want to drop a $150 SBC if I didn't have to.