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ReadiVoice Administration & Maintenance Guide
22 Proprietary & Confidential
Working with Translation Numbers
A translation number is the telephone network’s translation of the dialed
telephone number into a number used to route the call:
• For a routed PSTN system, your carrier provides a block or blocks of
translation numbers. Depending on the translation number type (see
“Changing System Configuration Settings” on page 118), your system
may randomly choose a number from this block, or it may use a
subscriber-specific fixed translation number. In either case:
a When someone dials a ReadiVoice access number, the originating
switch queries the CACS, which determines who the subscriber is and
returns a translation number (including prefix) to tell the telephone
network how to route the call.
b When the switch routes the call to the bridge, it sends the translation
number, with or without prefix, as DNIS (dialed number
identification system) digits.
c The bridge sends the DNIS to the CACS, which uses the last
n
digits
(where
n
is the Trans DNIS Length) to identify the conference.
• For a non-routed system or an IP system, you must enter a block of
dummy translation numbers. The number of digits must be the number
specified on the Bridges page as Trans DNIS Length (see “Maintaining
Bridge Information” on page 18).
In either type of system, each conference requires one translation number for
each different access number used to reach the conference (see “Working with
Access Classes” on page 33).
The maximum number of conferences is always the number of ports divided
by three. Therefore, the maximum number of translation numbers a bridge
might need is the smaller of:
• The number of access classes times one-third the number of ports.
• The number of ports.
Table 2-1 shows the results of this calculation for 480-port and 4032-port
bridges.
Table 2-1 Maximum number of translation numbers needed per bridge
InnoVox 480 with 480 ports
(max. 160 conferences)
InnoVox 4000 with 4032 ports
(max. 1344 conferences)
Access classes Translation numbers Access classes Translation numbers
1 160 1 1344
2 320 2 2688
3+ 480 3+ 4032