Default Numbering Plan in Version 3


The default numbering for system extensions is changed to 301-428 from 300-427. This makes it easier to correlate station ports to extension numbers. For example, station port 1 is extension 301, station port 2 is extension 302 and so on.

Department Groups, which have replaced Ring Groups and UCD Groups, are 601-632. See Department Groups for more.

Version 3 Numbering Plan Changes
Description Version 2 Version 3
Stations 300-427 301-428
Voice Mail Ports 501-508 No change
Voice Mail Master 700 No change
Ring Groups 600-607 Replaced by Department Groups
UCD Groups 700-707 Replaced by Department Groups
Department Groups N/A 601-632
Routing Mailboxes 801-832 No change