82
DTMF Signaling
Description
DTMF (Dual Tone Multi-Frequency) dialing, is the default method of dialing digits. DTMF dialing has the
advantage of placing calls more rapidly and more accurately than dial pulse (DP) signaling. G1-824
digital telephone systems are equipped to allow selection of the dialing type to be used for each individual
CO or PABX line. In applications where some Trunks are dial pulse and others are DTMF, the system
can be programmed to dial the correct type on each line.
In locations where Dial Pulse is the only method of dialing accepted by the Trunks, the G1-824i digital
telephone system can dial digits using dial pulse and then change to DTMF signaling for subsequent
digits. This is advantageous in any situation where the local Trunks require pulse signaling, but end-to
end signaling is required after the called party answers. Examples of this are remote voice mail,
Interactive voice message services, automated banking systems, and alternative long distance carriers.
See also Dial Pulse to DTMF conversion, page 61 of this document.
Conditions
DTMF is automatically generated when any G1-824 digital telephone set accesses a Trunk that is defined
as DTMF signaling on Mode 35-[TK]-02.
DTMF can be generated when a G1-824 digital telephone set is on a line defined as pulse dialing when
the [Pulse to Tone] key has been pressed.
Single Line Telephones equipped for DTMF dialing will dial normally on CO lines defined on Mode 46
[TK]-02 as DTMF.
Single Line Telephones equipped with Pulse dials will cause the system to perform pulse to tone
conversion on CO lines defined as DTMF on Mode 35-[TK]-02.
Note:
Single Line Telephones equipped for DTMF dialing that access CO lines programmed on Mode
35-[TK]-02 as Pulse lines will outpulse DTMF on the CO line. Pulse conversion provided by the G1-824
digital telephone system will also be outpulsed on the CO line. It is important that CO lines able to accept
DTMF dialing be programmed as DTMF equipped. CO lines with DTMF sensitivity that are programmed
for pulse dialing will provide unreliable dialing if used with DTMF single line telephones.
Programming
Mode 35-[TK]-02 must be programmed as [1] for each CO line able to accept DTMF signaling, in order to
provide DTMF signaling as the default method of dialing.
Mode 05-01-07, DTMF Generation Time must be programmed to provide DTMF tone duration equal to or
greater than the minimum time required by the local telephone company Central Office. Valid settings for
Mode 05-01-07 are listed below:
05-01-07. DTMF Generation Time:
This parameter permits the selection of DTMF Generation output time. The generation time may need
to be lengthened to access some Voice Mail or answering machines.
0=48 ms.
1=64 ms.
2=80 ms.
3=100 ms.
4=114 ms.
5=132 ms.
6=156 ms.
7=164 ms.
8=180 ms.
9=196 ms.
Operation
On CO lines defined as DTMF (Mode 35-[TK]-02), operation is automatic.
On CO lines defined as Pulse (Mode 35-[TK]-02), conversion to DTMF signaling is activated by pressing
the Pulse to Tone key from G1-824 digital telephone sets..
See also Dial Pulse to DTMF Conversion on page 61 of this document.
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