Line
188 Programming Guide
Parameter Mailbox No.
Default Same as the extension number
Value Range
Up to 16 digits consisting of 0 - 9,  , # or P [Pause]
Description/Function Specifies the mailbox number which is usually the same as the 
extension number.
Note
• This mailbox number is sent to the VPS as Follow-on ID 
when Inband Integration is activated.
Reference None
Parameter CO Key 
Default —
Value Range —
Description/Function You can enter into "Flexible CO Key" screen (Section 4.3.2) by 
clicking   on this screen.
Reference • 4.1.2 Customising the Buttons (U/M)
Parameter PF Key
Default —
Value Range —
Description/Function You can enter into "Flexible PF Key" screen (Section 4.3.3) by 
clicking   on this screen.
Reference • 4.1.2 Customising the Buttons (U/M)
Parameter Initial Display Selection
Default Caller ID
Value Range
1. Caller ID 
2.
Trunk Name
3. DDI / DID Name
Description/Function Specifies the initial display of a display PT when an incoming CO 
call with Caller ID information comes in on it.
Reference • 4.1.1 Initial Settings (U/M)