# NCC.X.ADI_START.dtmfdet

The following table describes NCC.X.ADI_START.dtmfdet parameters:

NCC.X.ADI_START.dtmfdet
Dependent function: nccStartProtocol
Field | Type | Default | Units | Description
--- | --- | --- | --- | ---
columnfour | DWORD | 1 | mask | Flag that indicates whether to detect the A, B, C, and D DTMF digits. Set this to 1 to detect these, or 0 to ignore them.
offqualampl | INT32 | -45 | dBm | Minimum signal required to maintain recognition of a DTMF signal once recognition has started. Valid range is -51 to -15.
offqualtime | DWORD | 40 | ms | Minimum duration of absence of a recognized DTMF signal before an end-of-digit event is emitted. Valid range is 5 to 32767.
offthreshold | DWORD | 0x92e0 | IDU | Do not modify.
onqualampl | INT32 | -39 | dBm | Minimum signal level recognized as a DTMF signal. Valid range is -51 to -15.
onqualtime | DWORD | 50 | ms | Minimum duration of a recognized DTMF signal before a digit event is emitted. Valid range is 22 to 32767.
onthreshold | DWORD | 0xcab0 | IDU | Do not modify.