Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 595)

Audio Commands
DTMF Decoding Mode +WDDM
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WM_DEV_OAT_UGD_049 - 001 VOLUME 4 August 23, 2007
21.13 DTMF Decoding Mode +WDDM
21.13.1 Description
This specific command allows activation of DTMF decoding.
21.13.2 Syntax
Action command
AT+WDDM=<mode>
OK
Read command
AT+WDDM?
+WDDM: <mode>
OK
Test command
AT+WDDM=?
+WDDM: (list of supported <mode>s)
OK
Unsolicited response
+WDDI: <char>,<duration>