Technical information

MERLIN LEGEND/MAGIX Toll Fraud
Issue 7 June 2001
5-41
 Whether or not the dialed digits are correct, an inter-digit time-out occurs
during the first attempt. The system processes only the valid number of
digits. So if a hacker enters four digits and the length is four digits, he or
she hears dial tone. If a hacker enters four digits and keeps entering more,
the system uses the time-out to hide the correct number of digits from the
hacker. The time-out recurs until the caller has dialed the eleventh digit—
giving the impression that additional digits are required—even if the barrier
code length is shorter.
 SMDR registers 16 zeros for any remote access calls in which three failed
attempts have occurred.
Trunk to Trunk Transfer
This section contains instructions to allow or disallow trunk-to-trunk transfer at
each extension.
If trunk-to-trunk transfer is disallowed on an extension in a private network, the
extension cannot transfer an outside call to a local system trunk connected to the
PSTN. See the Network Reference for more information.
Trunk-to-trunk transfer may only be performed on ground-start trunks and
loop-start trunks with reliable disconnect. As of Release 4.0, trunk-to-trunk
transfer may be performed on BRI, Tie lines, PRI, ground-start trunks, and
loop-start trunks that have reliable disconnect.
Trunk-to-trunk transfer is factory set to disabled and may be enabled for a specific
extension. Single-line telephones are restricted from completing a trunk-to-trunk
transfer.
Toll Fraud Investigation: Disallow List
Information
3
General Information
Hierarchy of ways to restrict an extension:
 FRL takes precedence over everything, except marked system speed
dials.
 Marked system speed dial takes precedence over anything.
 Allow list takes precedence over call restrictions (outward, toll,
unrestricted).
 Disallow list takes precedence over an allow list.
“Pauses” (p =wildcard): Have always been available on Legend disallow lists.
3. Published 8/8/00; Reviewed for accuracy by Sue Fulmer, Tier III Senior Engineer.