The NEC SV9100 has multiple “Internal Zones” and multiple “External Paging Zones”
By default all extensions are apart of “Internal Paging Zone 1” ( PRG 31-02 )
Internal Paging Zone 1 can be called by dialling 701 1
By default AUX1 on the CP-10 / 20 is set to external paging zone 1
External Paging Zone 1 can be called by dialling 703 1
Both internal zone 1 & external zone 1 can be called
Dial *10