If you do have a light on phone 1 then look at these possibilities.

Ip phone line forbidden. Inbound calls are working but when I try to do an outbound call I receive a Forbidden message in the IP phone display and the 3cx event log says the following. If you do not have a light reboot the IAD. In order to check this first disable the DHCP on the IP phone and then manually assign all the IP parameters such as the IP address TFTP DNS subnet mask etc.

This device must accept any interference received including interference that may cause undesired operation. After an IP phone user initiates a call an error message forbidden 403 is displayed on the LED. You should now be able to make and receive calls without the error Forbidden.

7 digits Local numbers 01 is access code for local dialing. If you get an error that says Line Invalid or Line Forbidden this would indicate that the base is not connected to the internet or your location may not be whitelisted. Wait for Register Status to display Registered.

Apple iPad Pro 97-inch Apple iPad Pro 129-inch Apple iPad Pro 129-inch 3rd Gen. Reboot the Yealink base unit as at present his phone line. It is important not to mention you are using a dialer.

A defective splitter or phone cable. Display shows FORBIDDEN via IP line unless the Handset is rebooted. If Cisco IP phones take a long time to register check whether the DHCP server works properly.

220219 0836 The user is not allowed to make external calls USERTELEPHONYSUPERVISOR SETTINGSOUTGOING CALL BAR. We can confirm this with some quick testing. Just ask them you are using a soft phone x lite to call and the call is not connected.