Instruction manual

Small business communications systems

6-40 Issue 9 May 2003

■ 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 Administration for Network Connectivity for Avaya™ Communication

Manager 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

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.

3. Published 8/8/00; Reviewed for accuracy by Sue Fulmer, Tier III Senior Engineer.