NEC Electra Elite IPK II Features And Specifications Manual page 430

Document Revision 1
Conditions
r Programming follows a telephone's extension number, not the port number in most cases.
If you relocate a telephone, you may need to change additional programming.
r If the extension numbering plan is changed from '3xx' to '2xx', and you would like to
consecutively press two DSS keys without toggling the hookswitch, Program 11-16-05
must be removed. If not, pressing the second DSS key will actually camp you on to the first
extension.
r Since making changes in Program 11-01 does not automatically make any other changes
in any other program, changing the number plan after the system is in operation may cause
problems in the following programs:
11-02
11-04
11-06
11-07
r Any feature which requires dialing a code or extension number can be affected.
2 - 408
11-01 Type 2
(Extension Number)
11-08 15-12
11-17 16-01-01
15-01-01 15-14
15-07 21-11
11-01 Type 1
(Service Codes)
22-11 11-10
25-06 11-11
30-03 11-12
11-13
Electra Elite IPK II
11-14 21-11
11-15 30-03
15-07
15-14
Flexible System Numbering