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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Prior Releases: Features and Enhancements
Page xxxvRelease 3.1 Enhancements (March, 1996)
Release 3.1 Enhancements
(March, 1996) 0
Release 3.1 includes all Release 3.0 functionality, plus the enhancements listed
below.
Call Restriction Checking for Star Codes 0
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 (CO). For example, in many areas, a telephone user can dial
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 0
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 0
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 CO 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 CO 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 CO is ready to receive more digits from the caller.
Security Enhancements 0
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 0
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 VMI (voice messaging interface) ports
used by voice messaging systems. The system manager can manually assign this
list to other extensions.