For admins

A phone won’t register

“Register” means the phone signs in to Linx. When it can’t, check in this order.

1. The address. The server is sip. in front of your domain, port 5061. The phone must be on your home or office network.
2. TLS. The phone’s transport must be TLS, not UDP or TCP.
3. The username and password, exactly as Linx showed them. If in doubt, open the phone in Extensions and choose New password, then enter it on the phone.
4. Encrypted audio (SRTP) set to required on the phone.
5. The phone’s clock. A phone with the wrong date can’t check Linx’s certificate. Set its time server (NTP).
6. Older phones may not trust Linx’s certificate or may lack TLS 1.2. Update their firmware.

Still stuck? System → Status shows the phone system’s Recent log, and linx doctor checks the phone ports.

Details of the settings: Desk phones and phone apps.