This is explained in Quick Start Guide which you can download from https://www.cytech.biz/user_guides.html?category_id=111
On the Keypad
Press F+6 The Keypad menu is
\"Select Phone\"
Select phone 1 to 8 to change the number
eg select 2 for Phone #2
The menu will say the current phone number programmed then
Press 0 for No Phone
1 for Voice Phone
4 for Monitoring station
6 for SMS
Select 1 for Voice Phone, then enter the phone number and # key
Another way to change phone numbers is to use Comfigurator.
Go to Security > Phone Numbers
On the right pane, Select the phone Type and enter the phone number
The SMS Phone Type and SMS-related parameters is visible only if you have the UCM/GSM Module installed
On the Keypad
Press F+6 The Keypad menu is
\"Select Phone\"
Select phone 1 to 8 to change the number
eg select 2 for Phone #2
The menu will say the current phone number programmed then
Press 0 for No Phone
1 for Voice Phone
4 for Monitoring station
6 for SMS
Select 1 for Voice Phone, then enter the phone number and # key
Another way to change phone numbers is to use Comfigurator.
Go to Security > Phone Numbers
On the right pane, Select the phone Type and enter the phone numberThe SMS Phone Type and SMS-related parameters is visible only if you have the UCM/GSM Module installed