Technical information

Voice Messaging Systems
6-42 Issue 7 June 2001
Basic Call Transfer
With Basic Call Transfer, after a voice mail system caller enters *T, the system
performs the following steps:
1. The voice mail system verifies that the digits entered contain the same
number of digits administered for extension lengths. If call transfer is
restricted to subscribers (for the DEFINITY AUDIX System and the Avaya
I
NTUITY System only), the voice mail system also verifies that the digits
entered match the extension number of an administered subscriber.
2. If Step 1 is successful, the voice mail system performs a switch-hook flash,
putting the caller on hold.
NOTE:
If Step 1 is unsuccessful, the voice mail system plays an error
message and prompts the caller for another try.
3. The voice mail system sends the digits to the switch.
4. The voice mail system completes the transfer.
With Basic Call Transfer, a caller can dial any number, provided the number of
digits matches the length of a valid extension. So, if an unauthorized caller dials a
transfer code followed by the first digits of a long-distance telephone number,
such as 91809, the voice mail system passes the numbers on to the switch. (This
is an example showing a 5-digit plan.) The switch interprets the first digit (9) as an
access code, and the following digits as the prefix digit and area code. At this
point, the caller enters the remaining digits of the phone number to complete the
call.
If call transfer is restricted to subscribers (for the DEFINITY AUDIX System and
the Avaya I
NTUITY System only), the caller cannot initiate a transfer to an
off-premises destination unless the digits entered match an administered
subscriber’s mailbox identifier; for example, 91809. To insure the integrity of the
subscriber restriction, do not administer mailboxes that start with the same digit(s)
as a valid switch Trunk Access Code. It is strongly recommended that all transfers
be restricted to subscribers when Basic Call Transfer is used.
Closely Monitor All Mailboxes
The use of INTUITY AUDIX system security features in combination with mailbox
administration can help reduce the risk of unauthorized use of mailboxes.
 Lock out multiple consecutive attempts to enter a voice mailbox. The
INTUITY AUDIX system has a password time-out feature that allows callers
three attempts in one call to correctly enter their password before they are
automatically disconnected. You can also specify how many consecutive
invalid attempts are allowed before a voice mailbox is locked.
 Deactivate unassigned voice mailboxes. When an employee leaves the
company, close or reassign the voice mailbox.
 Do not create voice mailboxes before they are needed.