VVX300 w/Yeastar Linkus - Random Un-registering/Re-registering

[webbyz]

I have a Poly VVX300 that I have been using with a IPSEC VPN Router to connect to my office for years so that I don't have to deal with getting the SIP Traffic through the firewall. 

The SIP Server in the office is a Yeastar S100 and I noticed they have a service called "Linkus" which allows you to do SIP registration to a cloud server rather than your office SIP Server. So I have been able to plug the VVX300 into my normal LAN and it seems to work....somewhat....

When I set up the VVX300 with the FQDN of the Linkus server, the phone will register and work for a period of time, but then I will start getting an error message on the screen saying "Line: Unregistered"

After somewhere between 15-60 seconds the phone will re-register and I will get the check mark on the line. Once connected, it will stay registered for anywhere between a minute to 10 minutes and then it will start the cycle again. It is worth noting that even when the line is Not Registered, I can receive and make calls. 

I have used the same settings on a 3CX SIP App on my PC and it will stay connected indefinitely, so I feel like there is a setting in the VVX300 that is causing this to happen. 

Does anyone have any ideas on what might be happening and how to fix it? 

[SteffenBaierUK]

Hello @webbyz ,

Welcome to the Poly Community.

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Best Regards

Steffen Baier

[webbyz]

Assuming that the main thing that I missed in my OP was versions, the associated versions are:

VVX-300:

UC Software Version	5.9.7.3480
Updater Version	5.9.7.45784

Yeastar S100:

Hardware Version: v1.20 0000-0000

Firmware Version: 30.15.0.102

[SteffenBaierUK]

Hello @webbyz 

I suggest you check the quoted posts again as we are missing a backup for example and some logs.

If you want us to help we would need these.

Best regards

Steffen Baier