R2511-HP MSR Router Series Voice Configuration Guide(V5)

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NOTE:

The dtmf time and dtmf amplitude commands in voice view have

lobal si

nificance. Once you carry ou

either of the two commands, the configuration will take effect on the whole device.

Configuring DTMF detection

Introduction to DTMF

Use the following ways to detect DTMF:

• Energy detection—DTMF detection is implemented by calculating the frequency spectrum of the

input voice signal. The energy threshold limits the spectrum shape of the input signal. A signal is

considered a valid DTMF only when all requirements are met.

• Sensitivity detection—A higher DTMF detection sensitivity reduces the possibility of missing the

detection of a true DTMF signal but increases the possibility of false detection; a lower DTMF

detection sensitivity reduces the possibility of false detection but increases the possibility of missing

the detection of a true DTMF signal.

Configuration procedure

To configure DTMF detection:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter voice subscriber line

view.

subscriber-line line-number N/A

3. Configure the DTMF

detection sensitivity.

dtmf threshold analog index

value

Optional.

By default, indexes 0 to 12 correspond to

1400, 458, -9, -9, -9, -9, -3, -12, -12, 30,

300, 3200, and 375, respectively. For

meanings of these parameters, see Voice

Command Reference.

This command is used by professional

personnel to adjust the device in the case

of DTMF detection failure. Usually, the

default value is adopted.

4. Configure the DTMF

detection sensitivity level.

dtmf sensitivity-level { high |

low | medium

[ frequency-tolerance value ] }

Optional.

By default, the DTMF detection sensitivity

is low.

This command is valid only for the

FXS/FXO voice subscriber line.

Support for the medium keyword

depends on the voice card.

5. Set the DTMF detection

sensitivity.

dtmf threshold digital value

Optional.

By default, the value of DTMF detection

sensitivity level is 0, that is, insensitive.

This command is only applicable to the

BSV voice subscriber line.