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ManualsBrandsAT&T ManualsNetwork RouterDEFINITY Remote Port Security Device
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Voice Messaging Systems
6-28 Issue 7 June 2001
Limit Outcalling
The measures you can take to minimize the security risk of outcalling depend on
how it is used. When outcalling is used only to alert on-premises subscribers who
do not have voice mail system message indicator lamps on their phones, you can
assign an outward-restricted COR to the voice mail system voice ports.
For DEFINITY ECS, DEFINITY G1, G3, and System 75:
Use change cor to display the Class of Restriction screen, and then create
an outward restricted COR by entering
outward in the Calling Party
Restriction field. The COR should carry an FRL of 0. Outward calling party
restrictions and calling permissions should be blocked from all trunk CORs.
Assign the outward restricted COR to the voice mail system voice ports.
For DEFINITY G2 and System 85:
Use PROC010 WORD3 FIELD19 to assign outward restriction to the voice
mail system voice ports’ COS. Assign an FRL of 0 to the COR, and enter
no for all Miscellaneous Trunk Group Restrictions.
When outcalling is used for subscribers who are off-site (often the message
notification is forwarded to a call pager number), three options exist to minimize
toll fraud: 1) the voice mail system voice ports can be assigned to a toll-restricted
COR that allows calling only within a local area, 2) the outcalling numbers can be
entered into an unrestricted calling list for either ARS or Toll Analysis, or
3) outcalling numbers can be limited to 7 or 10 digits.
On the voice mail system subscriber form, turn off outcalling by entering n
in the outcalling field.
On the voice mail system outcalling form, limit the number of digits that can
be dialed for outcalling; allowing exactly the number of digits required to
complete the call.
NOTE:
If outcalling is to a pager, additional digits may be required.
Protect AMIS Networking
To increase security for AMIS analog networking, including the Message Delivery
service, restrict the number ranges that may be used to address messages. Be
sure to assign all the appropriate PBX outgoing call restrictions on the voice mail
system voice ports.