Lucent Technologies MERLIN LEGEND Release 7.0 System Planning Manual page 46

MERLIN LEGEND Communications System Release 7.0
System Planning 555-670-112
Prior Releases: Features and Enhancements
Release 3.1 Enhancements (March 1996)
Call Restriction Checking for Star Codes
Beginning with Release 3.1, a system manager can add star (*) codes to Allowed
and Disallowed Lists to help prevent toll fraud. Star codes, typically dialed before
an outgoing call, enable telephone users to obtain special services provided by
the central office. For example, in many areas, a telephone user can dial *67
before a telephone number to disable central office-supplied caller identification at
the receiving party's telephone. You must contract with your telephone service
provider to have these codes activated.
When users dial star codes, the system's calling restrictions determine whether
the codes are allowed. If they are allowed, the system's calling restrictions are
reset, and the remaining digits that the users dial are checked against the calling
restrictions.
Trunk-to-Trunk Transfer Set for Each Extension
This enhancement to the Transfer feature enables the system manager to allow or
disallow trunk-to-trunk transfer on a per-extension basis. In Release 3.1 and later
systems, the default setting for all extensions is restricted.
Programmable Second Dial Tone Timer
The system manager can assign a second dial tone timer to lines/trunks, in order
to help prevent toll fraud (for example, when star codes are used). After receiving
certain digits dialed by a user, the central office may provide a second dial tone,
prompting the user to enter more digits. If this second dial tone is delayed, and the
user dials digits before the central office provides the second dial tone, there is a
risk of toll fraud or misrouting the call. The second dial tone timer enables the
system manager to make sure that the central office is ready to receive more
digits from the caller.
Security Enhancements
The sections below outline security measures that are implemented in Release
3.1 and later systems.
Disallowed List Including Numbers Often
Associated with Toll Fraud
A factory-set Disallowed List 7 contains default entries, which are numbers
frequently associated with toll fraud. By default, Disallowed List 7 is automatically
assigned to both generic and integrated voice messaging interface (VMI) ports
used by voice messaging systems. The system manager can manually assign this
list to other extensions.
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Issue 1
April 1999
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