Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 597)

Audio Commands
DTMF Decoding Mode +WDDM
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
Command Responses
AT+WDDM=0
Note: Stop DTMF decoding
OK
21.13.6 Notes
• The DTMF decoding will be only available for one applicative layer: ATI or Open
AT ® . If the DTMF decoding is requested by one part and then requested by
another part, a specific error (+CME ERROR: 558) will be returned to the
second part.
• The different audio filters retand processes in Rx path should not be activated
while DTMF decoding mode is set.
The following AT command is partially deactivated when DTMF decoding is
activated:
+WADF command
The different audio filters return in their old state when the DTMF decoder is
deactivated.
• When the decoder is enabled (with + WDDM AT command), each time an
incoming DTMF is decoded, an unsolicited response will be returned by the
Wireless CPU ® with DTMF value and its duration.
• DTMF decoder can be configured with the AT+WBHV command (see section
6.3 on "Wireless CPU ® Behaviour Configuration + WBHV", for more information).
It sets the blank duration parameter. It determines the minimal blank (no
DTMF) duration to be detected after one decoded DTMF to return the
unsollicited event +WDDI.
• Decoded DTMF signals will be notified only during a voice call.
• The DTMF decoding is only suspended when the voice call is finished and
when the SU does not request the DTMF decoding deactivation.