If there is a need to disable ringing on the phone, this can be done by enabling the Do Not Disturb feature.
To Enable Call Forwarding:
Pick up the phone and dial *72 then press Send. You will be prompted to enter the number you want to forward number to.
Press *72 to Enable.
To Disable Call Forwarding:
Pick up the phone and dial *73 then press Send. A recording will play advising the Call Forwarding has been disactivated.
Press *73 to Disable.