2.3 System Data ControlFeature Guide 1752.3.4 Feature NumberingDescriptionTo call another extension user or to access PBX features, access numbers (extension numbers or featurenumbers) are required.Feature numbers are available while:1. a dial tone is heard2. a busy, Do Not Disturb (DND), ringback tone is heard3. dialling or talking4. on-hook1. Feature Numbering (available while a dial tone is heard)Extension numbers and features that are available while a dial tone is heard have fixed numbers andflexible numbers respectively, shown in the following table:a) Extension Numbers:The extension numbering plan can be selected through system programming ( ExtensionNumber [009]).When the extension numbering plan is selected, the default extension numbers changeautomatically as follows*:Plan 1/Plan 2: extension jacks 01 through 24—extension numbers 101 through 124Plan 3: extension jacks 01 through 24—extension numbers 11 through 34If a rotary single line telephone (SLT) is used at any extension, select "Plan 1".Note* For United Kingdom and New Zealand, when the extension numbering plan is selected, thedefault extension numbers change automatically as follows:Plan 1/Plan 2: extension jacks 01 through 24—extension numbers 201 through 224Plan 3: extension jacks 01 through 24—extension numbers 21 through 44b) Feature Numbers:When "Plan 2" or "Plan 3" is selected, feature numbers starting with "7" are useable with andwithout "#" added before "7".[Example]The default feature number for setting "Do Not Disturb (DND)" is "714#". "714#" and "#714#" areboth available for "Plan 2" and "Plan 3".To make them easier to remember, it may be helpful to replace the new feature numbers for "Plan2" and "Plan 3" with the code numbers 50 through 59, through system programming ( SecondFeature Numbering Plan [012]).
