Technical information

Large Business Communications Systems
4-8 Issue 7 June 2001
The authorization code option requires that the caller enter a valid authorization
code to receive switch dial tone. The authorization code used for Remote Access
has an FRL value used by AAR/ARS/WCR trunks for outgoing calls [see ‘‘Facility
Restriction Level (FRL)’’ on page 4-17]. Up to 5,000 authorization codes can be
issued to System 75 R1V3 and DEFINITY G1 users, and up to 90,000 for
System 85, DEFINITY G2, and G3 users. However, it is best to keep the number
of authorized users to a minimum.
To maximize the security of the system, follow these steps:
 When assigning authorization codes, give the users the lowest possible
FRL needed for their calling requirements.
 Be sure to remove any unused authorization codes from the system,
including those assigned to employees who have changed assignments or
left the company.
 Assign each authorization code the minimum level of calling permissions
required.
 Make authorization codes nonconsecutive (random).
 Administer each authorization code to the maximum length allowed by the
system (7 digits).
NOTE:
When a call directed to a VDN points to a vector containing a Route To step,
and that Route To step attempts to utilize an authorization code, the call will
be denied.
Feature Access Code Administration
Certain Feature Access Codes may facilitate egress from the system and should
be used with care. These include: Data Origination, Data Privacy, Data
Restriction, Abbreviated Dialing, ARS/AAR, Call Forwarding, and Facility Test
Calls.
Trunk Administration
When trunk groups are administered they are assigned a Trunk Access Code
(TAC). Unless they are needed, prohibit both direct dial access and facility test
call access to trunk groups. This prevents callers from using TACs to obtain an
outgoing trunk.
Remote Access Dial Tone
For DEFINITY ECS, DEFINITY G1, G3, and System 75 R1V3, when a user
reaches the Remote Access port, if authorization codes are administered and
barrier codes are not used, the system can be administered so the caller will hear
a dial tone, a Remote Access tone, or silence as a prompt for the authorization
code.