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Calling Proof
Description
Calling Proof Capability is available to prevent circumvention of toll control by single line telephones
(Mode 05-07-02) and certain G1-824 digital telephone sets (Mode 05-07-05). These options are for use
mainly in situations where local dial tone is not immediately given by the telephone company. In
situations where dial tone is slow upon CO line seizure, it is possible that DTMF equipped single line
telephones may dial a valid digit before the central office has returned dial tone. The system will
disregard any digits dialed before dial tone is recognized and begin digit monitoring only after dial tone
has been recognized.
For Hybrex digital telephone sets, DTMF signaling is not done at the keyset. All DTMF is created by the
DTMF generator in the common control cabinet. However, the proliferation of add-on after-market dialers
that utilize acoustic coupling to dial stored digits has made this option a necessity for electronic sets as
well. The operation for electronic sets is exactly the opposite of that for single line telephones, since a
DTMF receiver is not normally attached for Superkey sets. The possibility exists that a call could be
placed via an external DTMF dialer that is in violation of the station's toll classification. If Mode 05-07-05
is enabled, the system will utilize DTMF receivers on the system just as if it were a single line telephone.
If enabled, any DTMF digit detected from the telephone handset will cause the telephone set to be
disconnected from the CO line.
Conditions
Conditions are as described above.
Programming
Single Line Telephone Calling Proof Capability, Mode 05-07-02 controls Calling proof capability and its
application to single line telephones. Valid settings are:
SLT Calling Proof, (Mode 05-07-02)
0=Disabled
1=Enabled
Digital Telephone Calling Proof Capability, Mode 05-07-05 controls the calling proof option for digital
telephone sets. Valid settings are:
Digital Telephone Calling Proof
(Mode 05-07-05)
0=Disabled
(External Dialer Allowed)
1=Enabled
(No External Dialer)
Operation
Operation is automatic. If calling proof is enabled and illegal digits are detected, the call will be
terminated immediately.
Summary of Contents for G1 8-24
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