Step 1:
Create a line group dedicated to the paging trunk port.
Go into the analog line properties page.
Change the line type to loop start (no ICLID).
Make the incoming and outgoing group value something unique like 99.
As long as these group values are not being used by another line, you will be fine. Also make sure this line is set to active.
Step 2: Create a short code –choose any available one such as *80 (your system may differ). Telephone number field is ‘.‘(just put in the period, not the single quote marks) and the line group ID is going to be what you set in Step 1. In our case, it is 99. The feature will be dial.
Short Code: *80
Telephone Number: . (just a period)
Group ID Number: 99
Step 3: Save your changes. Since you probably made changes to the line in Step 1,this will require a system reboot.
You should now be able to dial *80 from any phone and be connected to your paging system.