BusinessPhone Communication Platform 4.0
Commands > Commands 5000...5999

## 5604
Change of number series for extension

With this command it is possible to change all directory numbers for extensions. This command states the directory number which shall be the new lowest number for extensions. The exchange will now calculate the difference between this directory number and the previous lowest directory number. The difference may be positive or negative. To create the new number series, the calculated difference is added to each number in the present number series.

The exchange will verify that no number in the new number series is in conflict with any existing directory number for other telephony functions than extensions. Conflicts with previous extension number are accepted, # which means that the new number series may overlap with the existing number series.

If the new number series conflicts with any existing number for another telephony function, the existing number series will not be changed, but an error message will be shown on the operator’s display.

The examples below show how the rule for changing number series functions in a number of cases.

#### Example 1 Change of homogeneous number series

Homogeneous number series is a number series where all directory numbers contain the same amount of digits and the numbers in the series are consecutive.

Existing number series = |  | 200, 201, 202, ....238, 239 |
New first number = |  | 100 |
Difference = |  | -100 |
New number series = |  | 100, 101, 102, ....138, 139 |

#### Example 2 Change of homogeneous number series where the new number series contains fewer digits than the existing series.

Existing number series = |  | 200, 201, 202, ....238, 239 |
New first number = |  | 30 |
Difference = |  | -170 |
New number series = |  | 30, 31, 32, ....68, 69 |

#### Example 3 Change of homogeneous number series where the new number series contains more digits than the existing series.

Existing number series = |  | 200, 201, 202, ....238, 239 |
New first number = |  | 4000 |
Difference = |  | 3800 |
New number series = |  | 4000, 4001, 4002, ....4038, 4039 |

#### Example 4 Change of homogeneous number series where the new number series overlaps with the existing series.

Existing number series = |  | 200, 201, 202, ....238, 239 |
New first number = |  | 201 |
Difference = |  | 1 |
New number series = |  | 201, 202, 203, ....239, 240 |

#### Example 5 Change of inhomogeneous number series

Existing number series = |  | 203, 204, 209, ..406, ..1000 |
New first number = |  | 400 |
Difference = |  | 197 |
New number series = |  | 400, 401, 406, ..603, ..1197 |

Note

The new first number in the number series may be a vacant directory number selected at random and not being in conflict with directory numbers of other telephony functions. See also the command group description. If the first number in the number series is set to 0xxx, the leading zero will be ignored and the new first number will be xxx.

Note

If the existing number series is inhomogeneous, it may occur that two numbers in the new number series will conflict with each other.

#### Example

Existing number series = |  | 440, 621, 622, ... |
New first number = |  | 20 |
Difference = |  | -420 |
New number series = |  | 20, 201, 202, .. |

Numbers 201 and 202 are in conflict with number 20. This undesirable fact is not signalled by any error message, but must be taken into consideration before a number series change is initiated or the problem must be corrected afterwards, if it was detected that, dialling 201 or 202, extension 20 answers.

Minimum required authority level from telephone: No

Accessible via BMS: Yes

Revision: A © Ericsson Enterprise 2003