AT&T MERLIN LEGEND Data Manual page 62

Planning
Pool Dial-Out Code
Call Restrictions
3-18
Assigning Features to Data Stations
Use these instructions only if the system is operating in the Hybrid/PBX
mode.
When a data station is first connected, the user can access any trunk pool by
dialing the dial-out code assigned to the pool. However, you can restrict data
stations from using one or more trunk pools.
The pool dial-out code restriction places data calls only on specific trunk pools:
for example, to restrict users to trunk pools that are made up of special data
lines such as PRI channels used for data services or to reserve other trunk pools
for voice communications only.
Planning Form Instructions
Use the "Optional Features" section of Data Form 2a or 2b for each data
station to record your decisions. Under the "Pool Dial-OUt Code Restriction"
heading:
If you want the data station restricted from using one or more trunk pools,
check "Yes". Use PBX System Form 3b, Outside Trunks—Pools to locate
the dial-out codes for each pool that the data station is restricred from using.
Write the dial-out codes on the lines below the "Yes" box. If the data station is
a member of a modem pool, assign the same restriction to all members of
the pool.
When the system is first set up, all data stations are unrestricted. This means
that you can place local and long-distance calls from all data stations. However,
you can restrict selected data stations from making any outside calls and allow
only intercom (inside) calls. This is useful for data stations used only for
accessing a local host computer.
The calling privileges you assign to a modem or data module in a modem pool
determine what types of outside and toll calls are permitted and which line or
pool is used for the call. For example, a person with a data station restricted to
inside calls only can place an outside call using a modem pool if the modem or
data module used in the second stage of dialing is not restricted.
You can also restrict the types of data calls made through modem pools. For
example, to restrict a digital-to-analog modem pool to local calls to a host
computer in your city, you can restrict the modems from making long-distance
calls but still allow intercom and local calls. This type of restriction is useful to
prevent the abuse of long-distance calling privileges.
Note: Since modems in digital-to-analog modem pools on dedicated outside
lines are not connected to the control unit, they cannot be restricted by the
system.
If modem pools are to be used by outside callers, modems or data modules can
be restricted from making outside calls (to prevent abuse of services) by setting
up separate pools for incoming and outgoing calls.