Technical information

MERLIN LEGEND Communications System
Issue 7 June 2001
6-47
 Set the maximum number of digits in an extension parameter appropriate
to your dial plan. The voice messaging system will not perform transfers to
extensions greater than that number.
 When possible, restrict the off-network capability of callers by using calling
restrictions, Facility Restriction Levels, and Disallowed List features.
 Outward restrict all MERLIN LEGEND voice mail port extensions not used
for outcalling. This denies access to facilities (lines/trunks). Beginning with
Release 3.1, this is the default. You should change this setting only after
careful consideration.
 Create a Disallowed List to disallow dialing 0, 70, 011, 809, 1809, 0809, 10,
9999, 411, 1411, 800, 888, 700, 900, 976, 550, 1800, 1888, 1700, 1500,
1900, 1976, 1550, 0800, 0888, 0700, 0500, 0900, 0976, and 0550. Assign
all voice mail ports to this list. Avaya recommends using List 7 — the last
Disallowed List. This is an added layer of security, in case other restrictions
are inadvertently removed.
 If outcalling is required by users of the voice messaging system:
 Program an ARS Facility Restriction Level (FRL) of 2 for voice mail
port extension(s) used for outcalling.
 If 800 and 888 numbers are used as outcalling destinations, remove
1800 and 1888 from Disallowed List number 7.
 If outcalling is allowed to long distance numbers, build an Allowed
List and assign it to the voice mail port extension(s) used for
outcalling. On a two-port system, port 2 is used for outcalling. On a
four-port system, port 4 is used for outcalling. On a 6-port system,
ports 5 and 6 are used for outcalling. This list should contain the
area code and first three digits of the local exchange telephone
numbers to be allowed.
 When possible, block out-of-hours calling.
 Limit outcalling to persons on a need-to-have basis.
 Use the Transfer to Subscribers Only feature (MERLIN MAIL R3 Voice
Messaging System only).
 Require network dialing for all extensions, including voice mail port
extensions, to be through ARS using dial access code 9.
 Deny access to pooled facility codes by removing pool dial-out codes 70,
890-899, or any others on your system.
 Instruct employees to contact their System Administrator immediately if
any of the following occur:
 strange voice mail messages are received
 their personal greeting has been changed
 they suspect their MERLIN MAIL Voice Messaging System mailbox
is being used by someone else