Specifies frequency tolerances for digit detection. For DTMF
digits the value represents accept and reject ranges. For MF
digits the value represents only the accept range. Frequencies
detected within the accept range will result in digit detection.
Frequencies detected outside the reject range will not result
in digit detection.
. DTMF DTMF MFR1
VALUE ENUMERATION ACCEPT REJECT ACCEPT
----- ----------- ---------------- ------------------
1 narrow +/-2.0% +/-3.0% +/-(1.5% + 5Hz)
2 medium +/-2.5% +/-3.5% +/-(1.5% + 10Hz)
3 wide +/-3.0% +/-4.0% +/-(1.5% + 15Hz)
4 wider +/-3.5% +/-4.5% N/A