2.3 System Data Control190 Feature Guide2.3.5 Flexible Numbering/Fixed NumberingDescriptionTo dial another extension user or to access PBX features, access numbers (extension numbersor feature numbers) are required.There are three types of numbering plans:1) Flexible Numbering (available while a dial tone is heard)2) Flexible Numbering (available while a busy, DND, or ringback tone is heard)3) Fixed Numbering (available while dialing or talking)1. Flexible Numbering (available while a dial tone is heard)Extension numbers and feature numbers which are available while a dial tone is heard canbe customized for easy use ( Flexible Numbering [100]). The numbers must not conflict.It is also possible to use the default numbering (Pattern 1 or Pattern 2) shown in thefollowing table:a) Extension Numbers (Extension Numbering Scheme 1 through 32): Extensionnumbers can consist of up to four digits. They consist of either a one- or two-digitleading number (0-9 or 00-99) and a one- or two-digit suffix (0-9 or 00-99). The defaultsuffix is a two-digit number (00-99).[Example]If the number "3" is programmed as a leading number for the 1st extension numberingscheme, and "XX" is programmed as the additional digits, extension numbers 300through 399 are available.b) Feature Numbers: Up to four-digit number consisting of 0–9, " ", and "#"[Flexible Numbering Table (available while a dial tone is heard)]The default Flexible Numbering Table (Pattern 1 or Pattern 2) is selected when runningQuick Setup ( 2.3.3 Quick Setup).Feature DefaultPattern 1(with )Pattern 2(without )Extension Numbering Scheme 1—LeadingNumber1 11Extension Numbering Scheme 2—LeadingNumber2 12Extension Numbering Scheme 3—LeadingNumber3 13Extension Numbering Scheme 4—LeadingNumber4 14Extension Numbering Scheme 5—LeadingNumber5 15Extension Numbering Scheme 6—LeadingNumber6 16