Panasonic KX-TD500 - Manual (Page 299)

ARS (Automatic Route Selection)
Programming Guide 299
Parameter Number to be added
Default Blank
Value Range Up to 20 digits consisting of 0-9, , # or P [Pause]
Description/Function Specifies the dialling number to be added to the beginning of the
user-dialled number.
Reference • 1.6 Originating Features(F/G)
– Automatic Route Selection (ARS)