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112... Advanced features
12.1
Voice or data connection
The modem
has a function which enables it to decide whether the
incoming call is a voice or data call. This function is controtled by the
+B command,
+B1 switches it on, while +BO switches it off.
In order to use this facility, two requirements have to be met. First,
auto answer must be enabled; second, the calling modem must use
the 1300 Hz call fone, i.e. it has to be an auto dialling modem.
With the automatic detection on, the modem will, after it has
connected to the telephone line, first check for the presence of the
1300 Hz call tone. If present, the modem will continue with the
standard V.25 auto answer procedure.
If not present, the modem will indicate the incoming voice call by
generating a tone in the loudspeaker, and at the same time transmit
a ringing tone back to the calling end. tn order to answer the call, first
the handset has to be lifted off on the phone set connected to the
modem; second, the modem
must go on hook. This can be done
either by a push on the ROLL/EXEC buttons, or by sending a
character from the DTE. The voice connection is now established,
and is terminated the normal way, simply by placing the handset on
the cradle.
LZTR104006 R1.00
12-1
Zat 14.4/14.4-7 and 19.2/19.2-7
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