2.3.6 Flexible Numbering/Fixed NumberingDescriptionTo dial another extension user or to access PBX features, the access numbers (extension numbers or featurenumbers) are required.There are three types of numbering plans:1. Flexible Numbering (available while a dial tone is heard)2. Flexible Numbering (available while busy, DND, or ringback tone is heard)3. Fixed Numbering (available while dialling 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 can be customisedfor easy use. The numbers must not conflict. It is also possible to use default (Type 1 or Type 2) shown inthe following table:a. Extension Numbers: Extension numbers consist of leading numbers and additional numbers.Extension numbers (consisting of "0" through "9") can be assigned as follows:• Numbering schemes: 1-64• Leading number: up to three digits• Additional number: up to two digits (default: two digits)b. Feature Numbers: A number of up to four digits, consisting of "0" through "9", " ", and "#"c. Other PBX Extension Numbers (Other PBX Extension Number [TIE] -1 through 16): A number ofup to three digits, consisting of "0" through "9", " ", and "#"[Flexible Numbering Table (available while a dial tone is heard)]FeatureDefaultType 1(with )Type 2(without )Extension Numbering Scheme 1—Leading Number 1 / 2 10Extension Numbering Scheme 2—Leading Number 2 / 3 11Extension Numbering Scheme 3—Leading Number 3 / 4 12Extension Numbering Scheme 4—Leading Number 4 / 1 13Extension Numbering Scheme 5—Leading Number None 14Extension Numbering Scheme 6—Leading Number None 15Extension Numbering Scheme 7—Leading Number None 16Extension Numbering Scheme 8—Leading Number None 17Extension Numbering Scheme 9—Leading Number None 18Extension Numbering Scheme 10—Leading Number None NoneExtension Numbering Scheme 11—Leading Number None 20Extension Numbering Scheme 12—Leading Number None 21Extension Numbering Scheme 13—Leading Number None 22Extension Numbering Scheme 14—Leading Number None 23Feature Guide 3532.3.6 Flexible Numbering/Fixed Numbering
