Installation manual

IVX 128 System programming: an introduction
C.3
System fixed numbering plan
Numbers Function
0 Operator
1–66 CO lines
100–183 User extensions
199 Overhead paging port
290–299 Department pilots
300–489 Guest/info mailboxes
490–499 Q & A mailboxes
500 Broadcast mailbox
501–516 Group mailboxes
520–529 Cascade paging mailboxes
530–550 Recordable system prompts
560–589 Feature codes
590–598 MOH recordings
600–699 System speed dial