Hi all, hoping someone can help spot what I'm missing. I've been troubleshooting this for a while and have ruled out everything I can think of.
Setup:
Symptom:
What I've already tried:
Question: Since the phone's own log shows successful local operations (like "Operation completed" after Auto Provision Now) but 3CX's Event Log shows nothing at all, is there a way to check server-side whether requests are even reaching the provisioning endpoint? Could this indicate an issue with the specific device/token entry rather than the phone or network?
Any pointers appreciated — happy to provide more detail.
Setup:
- 3CX Hosted PRO
- Extension 1004, Yealink T85W
- Connection type: Router Phone ("Connect directly"), matching 3CX's documentation for cloud deployments
Symptom:
- Phone permanently shows "No Service"
- Voice & Chat admin page shows red/inactive status for this device
- Event Log shows zero entries related to this device or extension, even after multiple manual triggers
What I've already tried:
- Deleted/recreated the phone entry from scratch (initially had wrong connection type — "Local LAN/VPN" — corrected to Router Phone)
- Full factory reset of the phone
- Confirmed MAC address matches exactly in both places (no dashes/colons, per your docs)
- Confirmed correct date/time on the phone
- Tested reachability over both wired Ethernet and WiFi — phone gets a valid IP either way, and I can reach the phone's own web UI and my 3CX FQDN fine from the same network
- Disabled a "DHCP VLAN" setting I found enabled on the phone
- Manually entered the Auto Provision URL directly in the phone's web UI — phone reports "Operation completed" but still nothing in the Event Log
- Manually filled in SIP account fields (Account → Register) with the Auth ID/password from the 3CX device page, port 5061/TLS — got "Register failed"
- Checked if DHCP Option 66 might help — my router (carrier-provided) doesn't expose that setting
- Confirmed this isn't a licensing/subscription issue — currently on PRO trial (not yet expired), other extensions and the SIP trunk are working fine
Question: Since the phone's own log shows successful local operations (like "Operation completed" after Auto Provision Now) but 3CX's Event Log shows nothing at all, is there a way to check server-side whether requests are even reaching the provisioning endpoint? Could this indicate an issue with the specific device/token entry rather than the phone or network?
Any pointers appreciated — happy to provide more detail.
