Yealink T54W over StarLink

[jimkski]

I've been climbing this hill for a few days now: Remote Yealink T54w will not connect to 3cx enterprise server hosted on aws
Have a user in New Hampshire (I'm in TX so long drive for support) attempting to use a t54w over a starlink internet connection. I configured the phone locally here in TX and connected to a couple of different networks that do not have sbc to double check that the phone would connect to my 3cx instance hosted remotely on AWS. All was wonderful and I've done this with a few phones and have never had them fail when connected at their ultimate service location. At the remote location they have connected the phone to their local network via both wifi and ethernet with same result.
The remote IP address is not blacklisted and I've tried whitelisting it just because.
Any thoughts would be greatly appreciated.
Further info
Just got this message on 3cx
This IP Address XXX.XXX.XXX.XXX has made numerous attempts to authenticate with 3CX using invalid credentials. In response, 3CX has blacklisted this IP and denied any further requests.

I can obviously remove the blacklist entry, but don't understand the cause of the invalid credentials.

 

[JohnS_3CX]

You need two things, the rest is up to the network:

1. Make sure the Yealink is running the firmware version from here otherwise it won't work: https://www.3cx.com/docs/phone-firmwares/

2. You need to provision the phone as a router. If in doubt you can check here to confirm


If the above are done correctly and in this specific order it should work no matter where you take it.

If it can't work in this mode on their connection but can works fine elsewhere, then you likely have a restriction from your ISP.

 

[Colorado VoIP]

we have multiple customers running routerphones over starlink's CGNAT and there are no issues with it connecting. so starlink itself shouldn't be the problem as long as it's truly running as a router phone. STUN will not work (we tested that on starlink too), but subsequent phones behind the initial SBC communicate just fine as well.

like support said, run at least one SBC and you're going to be fine. I even take a 54W camping some times when i have the "glamper" hooked up to 120v and make calls like i'm in the office and nobody knows the wiser, and i do this off a wifi only starlink mini.