Nortel CallPilot Administrator's Manual page 141

When a local caller enters 9-555-1212 as the DTT number, the access code
9 is replaced by the DTT prefix 9.
Prefixes for internal numbers
If you want to allow users to send DTT messages to internal extensions,
you must set up a separate DTT prefix. This prefix is different, however,
from others because it does not require an associated dialing code. Dialing
codes are for access to the public network, and internal extensions are on
your private network. When sending DTT messages to internal extensions,
the prefix is simply stripped out of the address and the local extension is
dialed. The prefix is needed to inform CallPilot to use the DTT service.
A DTT prefix for each dialing scenario
You need a DTT prefix and associated dialing code for each dialing scenario
that you want to allow. This is because the system requires a different
dialing code to place a call in each of the scenarios. For example, one
dialing code (such as 9) is used to place local calls, whereas another (91) is
used for long distance calls.
Dialing scenario
Internal: For internal extensions
ESN: For numbers on your private ESN network, if you have
one
Local: For local numbers on the public network
Long distance: For long distance numbers in the same
country code
International: For long distance numbers with different
country codes
DTMF confirmation
You can specify whether DTMF confirmation is required either on a
user-by-user basis or on a system-wide basis.
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Copyright © 2007, Nortel Networks
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If most users who receive DTT messages have rotary telephones,
disable DTMF confirmation for the entire system.
If most users who receive DTT messages have answering machines,
disable DTMF confirmation for the entire system.
If users must be able to send messages to a diversity of recipients,
such as in different parts of the world where there might or might not be
DTMF support, enable or disable DTMF confirmation at the user level.
Nortel CallPilot
Administrator Guide
NN44200-601 01.11 Standard
5.0 9 November 2007
Defining address prefixes for both DTT and DTF 141
Example
prefix
56*
6
9
91
9011
Corresponding
dialing code
none
6
9
91
9011