This feature requires a license per twinning extension , the system comes with 4 already licensed
Make sure you have a valid extension number in PRG 11-02 against an un-equipped end ( example port 99 = extension 199 )
Program that extension number to point to a speed dial location PRG 15-22
Set the speed dial location assigned to the external number
Use:
Direct a call to internal extension 199, the call will be routed to the speed dial destination.