i-modul ISDN HIX V4
Special AT Commands for Voice Functions
14.4
AT Commands for DTMF Detection
These commands allow the DTMF detection for DTMF signals on the B channel of
the ISDN line.
The DTMF detection is only possible, if the B channel protocol is configured to
transparent (
ATB5
) and the output of the received data is disabled
(
AT**RCVDATA=0
).
Detected and valid received DTMF signals are output via the V.24 interface using
the following syntax within the V.24 data stream.
Default values are printed bold.
Command
Description
AT**RCVDATA
Disables the output of B channel data
This command disables the output of B channel data, which have been
received via the ISDN line, via the V.24 interface.
Note:
Only possible, if
ATB5
is configured.
ATRCVDATA=0
Disables the reception of data from the ISDN line
ATRCVDATA=1
Enables the reception of data from the ISDN line
AT**RCVDTMF
Enables the evaluation of DTMF signals
This command enables the evaluation of DTMF signals, which are received
via the ISDN line.
ATRCVDTMF=0
Disables the evaluation of DTMF signals
ATRCVDTMF=1
Enables the evaluation of DTMF signals
The received DTMF tones are output as follows:
<DLE>1
Key "1" of the connected phone pressed
<DLE>2
Key "2" of the connected phone pressed
<DLE>
*
Key "*" of the connected phone pressed
<DLE>
#
Key "#" of the connected phone pressed
<DLE>
is output as hexadecimal value 0x10
Table 18: Overview of AT commands for DTMF detection
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