Using Dual-Tone Multifrequency Signalling - Siemens Gigaset S4 professional User Manual

Making calls – enhanced functions
Step by Step
Using dual-tone multifrequency
signalling
Your handset operates on the basis of digital informa-
tion transmission. However, certain applications,
forexample, answering machines, can only be operated
using analog technology. For this you must send signals
using the dual-tone multifrequency signalling (DTMF)
process.
Depending on how your system is configured (automat-
ic tone dialling on or off - to be configured by the service
engineer) you must first switch to DTMF dialling. This
means, forexample, that you can communicate with a
variety of voice storage systems.
You will find further details in the operating instructions
for the relevant applications.
If you on a call, DMTF dialling is always activated.
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