BT Versatility
Owner's Manual
99
Setting up and using ISDN
If your BT Versatility is equipped with ISDN access, there are a number of additional features
available.
Multiple Subscriber Numbering (MSN) / Direct Dialling In
(DDI)
Your ISDN Network Provider can allocate more than one number to each of your ISDN Accesses.
This ISDN supplementary service is called either Multiple Subscriber Numbering (MSN) or Direct
Dialling In (DDI). (MSN numbers are allocated to each Point-to-Multipoint (P-MP) ISDN Access.
DDI numbers are allocated across all your Point-to-Point (P-P) ISDN Accesses).
These numbers may be programmed to ring individual extensions allowing callers to dial through
directly. You may also choose to allocate a number to a group of extensions, so that a caller may
dial through to that particular group.
A typical way of using this facility is to publicise one of these numbers as a fax number and then
route calls received on this number through to a fax machine connected to an extension. Another
typical use is to have users publicise their individual numbers and have callers ring directly
through to their extensions, but retain at least one number to ring on a Line that can be provided
with call services such as Auto-attendant, System voicemail box and Courtesy Service.
MSN/DDI numbers are also sent to the network as the Calling Line ID (CLI) for presentation to the
called party.
You may associate names with your MSN/DDI numbers and use the Tele-secretary feature to
have the name displayed for incoming calls.
You can programme your system to recognise up to one hundred MSN/DDI numbers. Each is
given an Index from 01 to 100.
If your ISDN Accesses are P-P then the 100 Indices can be shared across all ISDN Accesses.
If your ISDN Accesses are P-MP mode, each Access can be allocated up to ten Indices.
To programme DDI numbers with names and have them ring Extensions:
If your switch is equipped with P-P Accesses then you programme DDI numbers.
•
From the Programming Extension, press the PROGRAMME Key
•
Press the Scroll Down Key (
Ô
) until ‘System programming’ is displayed.
•
Select ‘System programming’.
•
Enter the System Programming Password and select ‘Lines’.
•
Press the Scroll Down Key (
Ô
) until ‘DDI programming’ is displayed
•
Select an Index from 001-100. All currently programmed indices are also shown
•
Enter the DDI telephone number (as supplied by your Network Provider). A total of fifteen
digits can be entered
•
Select ‘Confirm’.
•
Enter a name as described on page 16 and press Confirm
•
Select Day Mode, night mode or both.
•
Select the Extension or Group the DDI Number is to call
Press the Hands-free Key to finish programming.
