When a desk phone is on but says no service this ar the steps to follo to check for issues
1.First troubleshooting step: connect to the phone's web GUI to check if the configurations are correct.
2.Chek to make sure the IP on the phone is the same as SBC device and make sure it matches on ther 3CX server.
3. Check to make sure all cables are connected properly and are working normally
4. Make sure the WiFi on the phone is turned off
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