Intercom Code Range

The Intercom Code Range object is a child of the Dialing Plan object. It defines a range of short codes mapped to the directory numbers used for Business Group Lines in this Business Group. These intercom codes are equivalent to internal extension numbers on a PBX, allowing subscribers within the Business Group to dial another number within the group using the intercom code instead of the full directory number.


If you use both Intercom Codes and Caller ID within a Business Group, the displayed calling number for an internal call is the intercom code (if one is assigned) and not the full directory number. Some telephone handsets that support Caller ID can only display the digits 0-9, and not the # or * characters. If you use these characters in Intercom Codes, be aware that some telephones may not display them correctly.



Because the range of intercom codes maps to a range of directory numbers, it is possible to set up an Intercom Code Range where some of the codes in the range map to directory numbers that are not currently assigned to Business Group Lines. The EMS does not prevent this configuration, but a subscriber within the Business Group who dials a code not corresponding to a valid Business Group Line will hear a "number unavailable" announcement.


Parameter

Access

Description
First code Create The first intercom code in the range. Specify a code consisting of 1-7 characters corresponding to telephone keys. The first character may be #, *, or one of the digits 0-9, and any remaining characters must be digits 0-9; if the first character is # or *, it must be followed by at least one digit. You are recommended not to define intercom codes beginning with the digit 0 (zero) because this may be confusing for users. If the Business Group includes SIP subscribers, the initial digits of the code must not match any Call Services access code. For example, do not configure an intercom dialing code of *345 if you use *3 for an access code.
Last code Change The last intercom code in the range. Specify a code consisting of 1-7 characters corresponding to telephone keys, according to the following restrictions:
  • This code must be the same length as the First Code.
  • If the first character of the First Code is # or *, the first character of this field must be the same. All other characters must be digits 0-9.
  • The numeric value of the digits in this code must be equal to or greater than the First Code.
  • No value in the range between First Code and Last Code may match any other short code defined for this Business Group.
First Directory number Create The first directory number in this Business Group to which this range of intercom codes applies. The length of the range of directory numbers is determined by the range of intercom code numbers you specify. You must choose this directory number so that all the directory numbers in the range lie within one or more adjacent Business Group Number Blocks that are children of this Business Group. Click on the ellipsis symbol at the end of the field to select a Business Group Number Block from the list of this Business Group's child number blocks, and then to select the directory number from within this number block.
Last Directory number Read only This field specifies the last directory number in the range.