4. Global Dial Pulse Detection

4.1. Global Dial Pulse Detection Overview

Global Dial Pulse Detection (GDPD or Global DPD) allows applications to detect dial pulses from rotary or pulse phones and use them as if they were DTMF digits. GDPD is a software-based dial pulse detection method that can use country-specific parameters for extremely accurate performance. It provides the following features and benefits:

• Global DPD does not require a leading "0" to train the DPD algorithm. The algorithm is adaptive and can train on any DPD digit it encounters, with the greatest accuracy produced from training on a digit that has 5 or more pulses.
• Global DPD can be performed simultaneously with DTMF detection. The application can determine whether the digit detected is a DTMF or DPD digit.
• Global DPD can be performed simultaneously with Global Tone Detection (GTD). For example, the application can use GTD to monitor for disconnect tones (dial tone or busy) simultaneously with DPD.
• Global DPD supports pulse-digit cut-through during a voice playback, with the correct digit returned in the digit buffer. Global DPD uses echo cancellation, which provides more accurate reporting of digits during voice playback.
• The application can enable Global DPD and Volume Control. (Previously, there was a restriction that DPD digits had to be sent to the event queue instead of the digit queue if Volume Control was enabled.)

NOTE:

Speed Control is not supported while the GDPD feature is enabled on the D/160SC-LS-IDPD, D/240SC-T1-IDPD, D/300SC-E1-75-IDPD, D/300SC-E1-120-IDPD and D/320SC-IDPD boards. You may adjust the speed before or after placing or receiving a call that uses GDPD. If any speed control adjustments are attempted while GDPD is enabled, the function will return with a -1 indicating failure.

Global DPD is supported in the SAMPLE demonstration program located in the SAMPLES\VOICE directory under the Dialogic home directory (normally C:\Program Files\Dialogic).

GDPD is supported on the following boards:

• D/41ESC
• ProLine/2V
• D/21H, D/41H
• VFX/40ESCplus
• D/160SC-LS-IDPD
• D/320SC-IDPD
• D/240SC-T1-IDPD
• D/300SC-E1-120-IDPD

Global DPD works only on DPD-enabled boards. You must order a separate GDPD enablement package from Dialogic to enable GDPD on the boards listed above (except for boards with the "IDPD" suffix, which are already enabled).

To indicate that a board is DPD-enabled, apply the sticker provided with the GDPD enablement package to your board. Additionally, it is recommended that you write down the serial number of the DPD-enabled board for your records.

GDPD is available on all boards supported except the D/21D, D/41D, DIALOG/4, VFX/40, VFX/40E, VFX/40SC and VFX/40ESC boards.

GDPD is supported in the SAMPLE demonstration program located in the SAMPLES\VOICE directory under the Dialogic home directory (normally C:\Program Files\Dialogic).

Global DPD supported applications are: Analog applications using the loop start telephone interface on the D/41ESC (and other low density boards) or D/160SC-LS-IDPD voice boards; and digital applications using the D/300SC-E1-75-IDPD or D/320SC-IDPD voice boards.

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