Avaya Communication Manager Administrator's Manual page 1317

Ext Len
Specifies the number of digits the extension can have. On page 1, this field displays the
extension length entered as a qualifier on the command line (change
public-unknown-numbering n).
Total CPN Len
Valid entries
0 to 15 or blank
Trk Grp(s)
Communication Manager generates the station's identification number if there is an entry in the
Ext Code field, and this field is administered with the trunk group number carrying the call.
Valid entries
1 to 7 digits
blank
Valid entries Usage
0 to 7 or blank Corresponds to the extension lengths
allowed by the dial plan.
Usage
Enter the total number of digits to send.
Usage
Enter the valid administered ISDN trunk-group number
or a range of group numbers. For example, if trunk
groups 10 through 24 use the same CPN Prefix, enter
10 to 24.
The identification numbers are not dependent on which
trunk group the call is carried.
Numbering — Public/Unknown
Issue 1 June 2005 1317