5.5.7 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 a 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 the default settings shown in thefollowing 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)]Feature DefaultExtension Numbering Scheme 1—Leading Number 1 / 2Extension Numbering Scheme 2—Leading Number 2 / 3Extension Numbering Scheme 3—Leading Number 3 / 4Extension Numbering Scheme 4—Leading Number 4 / 1Extension Numbering Scheme 5–20—Leading Number NoneExtension Numbering Scheme 21—Leading Number 50Extension Numbering Scheme 22—Leading Number 51Extension Numbering Scheme 23—Leading Number 52Extension Numbering Scheme 24—Leading Number 53Extension Numbering Scheme 25—Leading Number 54Extension Numbering Scheme 26—Leading Number 55Extension Numbering Scheme 27—Leading Number 56Extension Numbering Scheme 28—Leading Number 57Extension Numbering Scheme 29—Leading Number 58Extension Numbering Scheme 30—Leading Number 59Extension Numbering Scheme 31—Leading Number 6486 Feature Guide5.5.7 Flexible Numbering/Fixed Numbering
