The LINEDIGITMODE_ constants describe different types of inband digit
Uses rotary pulse sequences to signal digits. Valid digits are 0 through 9.
Uses DTMF tones to signal digits. Valid digits are 0 through 9, '*', '#', 'A',
'B', 'C', and 'D'.
Uses DTMF tones to signal digits and detect the down edges. Valid digits are 0
through 9, '*', '#', 'A', 'B', 'C', and 'D'.
No extensibility. All 32 bits are reserved.
A digit mode can be specified when generating or detecting digits. Note that
pulse digits are generated by making and breaking the local loop circuit. These
pulses are absorbed by the switch. The remote end merely observes this as a
series of inband audio clicks. Detecting digits sent as pulses must therefore be
able to detect these sequences of 1 to 10 audible clicks.
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