CPN Prefix

The number that is added to the beginning of the extension to form a Calling or Connected Number.

• blank — the extension is sent unchanged. Use in countries where the public network is able to insert the appropriate CPN Prefix to form an external DID number.

• If the CPN Prefix length matches the Total CPN Len, the extension number is not used to formulate the PN number.

• If the CPN Prefix length plus the extension length exceeds the Total CPN Len, excess leading digits of the extension are deleted when formulating the CPN.

• If the CPN Prefix length plus the extension length is less than the Total CPN Len, the entry is not permitted

• If the Total CPN Len is 0, no calling party number information is provided to the called party and no connected party number information is provided to the calling party.

Ext Code

Can be up to 7 digits, but cannot be greater than the Ext Len field.

• attd — attendant

• 0 — Ext Len field must be 1 and the DDD number must be 10 digits

• 0 to 9 or blank

Example: When Ext Len is 4, Ext Code of 12 represents all extensions of the screen 12xx, excluding any explicitly listed longer codes. If code 123 is also listed, the Ext Code 12 represents all extensions of the screen 12xx except extensions of the screen 123x.

Ext Len

Number of digits for the extension, as entered on the command line (list public-unknown-numbering n).

Total CPN Len

Total number of digits to send.

0 — no calling party number information is provided to the called party and no connected party number information is provided to the calling party.

Trk Grp(s)

Number of the ISDN trunk group carrying the call, or the range of trunk groups that use the same CPN Prefix.

blank — IEs are not dependent on which trunk group carries the call.