DTMF Parameters

The dual-tone multi-frequency (DTMF) parameters are described in the table below.

DTMF Parameters

Parameter

Description

'DTMF Transport Type'

configure voip > media voice > DTMF-transport-type

[DTMFTransportType]

Defines the DTMF transport type.

■ [0] Mute DTMF = DTMF digits are removed from the voice stream and are not relayed to remote side.
■ [2] Transparent DTMF = DTMF digits remain in the voice stream.
■ [3] RFC 2833 Relay DTMF = (Default) DTMF digits are removed from the voice stream and are relayed to the remote side according to RFC 2833.
■ [7] RFC 2833 Relay Decoder Mute = DTMF digits are sent according to RFC 2833 and muted when received.

Note: The parameter is automatically updated if the parameters [FirstTxDTMFOption] or [RxDTMFOption] are configured.

'DTMF Volume' (-31 to 0 dB)

configure voip > media voice > DTMF-volume

[DTMFVolume]

Global parameter defining the DTMF gain control value (in decibels). For analog interfaces, this is the gain control to the Tel side.

You can also configure the feature per specific calls, using Tel Profiles ('DTMF Volume' parameter). For a detailed description of the parameter and for configuring the feature in the Tel Profiles table, see Configuring Tel Profiles.

Note: If the feature is configured for a specific Tel Profile, the settings of the global parameter is ignored for calls associated with the Tel Profile.

DTMF Generation Twist

configure voip > media voice > DTMF-generation-twist

[DTMFGenerationTwist]

Defines the range (in decibels) between the high and low frequency components in the DTMF signal. Positive decibel values cause the higher frequency component to be stronger than the lower one. Negative values cause the opposite effect. For any parameter value, both components change so that their average is constant.

The valid range is -10 to 10 dB. The default is 0 dB.

Note: For the parameter to take effect, a device restart is required.

inter-digit-interval

[DTMFInterDigitInterval]

Defines the time (in msec) between generated DTMF digits (to the Tel side for the Gateway application) if FirstTxDTMFOption = 1, 2 or 3.

The valid range is 0 to 32767. The default is 100.

[DTMFDigitLength]

Defines the time (in msec) for generating DTMF tones (to the Tel side for the Gateway application) if FirstTxDTMFOption = 1, 2 or 3. It also configures the duration that is sent in INFO (Cisco) messages.

The valid range is 0 to 32767. The default is 100.

configure voip > media voice > digit-hangover-time-rx

[RxDTMFHangOverTime]

Defines the Voice Silence time (in msec) after playing DTMF or MF digits (to the Tel side for the Gateway application) that arrive as Relay (from the IP side for the Gateway application).

Valid range is 0 to 2,000 msec. The default is 1,000 msec.

configure voip > media voice > digit-hangover-time-tx

[TxDTMFHangOverTime]

Defines the Voice Silence time (in msec) after detecting the end of DTMF or MF digits (on the Tel side for the Gateway application) when the DTMF Transport Type is either Relay or Mute.

Valid range is 0 to 2,000 msec. The default is 1,000 msec.

'NTE Max Duration'

configure voip > media voice > telephony-events-max-duration

[NTEMaxDuration]

Defines the maximum time for sending Named Telephony Events / NTEs -- RFC 4733/2833 DTMF relay -- (to the IP side for the Gateway application), regardless of the DTMF signal duration on the other side (TDM for the Gateway application).

The range is -1 to 200,000,000 msec. The default is -1 (i.e., NTE stops only upon detection of an End event).