navbarPDF
Strip_Prob_solu

Reducing Dialogic Off-Hook Delay for Unity PBX Integrations

Contents

Introduction

This document explains how to prevent the loss of dual tone multifrequency (DTMF) packet digits by reducing the Dialogic off-hook delay in Cisco Unity private branch exchange (PBX) integrations.

Problem

With some analog PBX integrations, such as Lucent/Avaya, the PBX can send DTMF signaling digits before the Dialogic card is ready to receive the digits. As a result, Cisco Unity can miss the first digit of the DTMF packet.

Symptoms

When an integrated call arrives, Cisco Unity may unexpectedly do one of the following:

Note: Integrated calls can be direct subscriber calls or forwarded calls.

Affected Products

This problem applies to Cisco Unity 2.4.0 through 3.0(2).

Solution

If possible, program the PBX to pause before sending the integration digit. Consult your PBX documentation or contact your PBX vendor for support.

If the PBX cannot be programmed to pause before sending the DTMF, reduce the Dialogic off-hook delay setting according to the procedure below. Note that this procedure applies only to systems with Dialogic voice cards and to each Dialogic card in the system.

Step-by-step Instructions

  1. Log in to Cisco Unity using administrative rights.

  2. Shut down Cisco Unity using the tray icon.

  3. Start the Dialogic Configuration Manager. Go to Start > Programs > Dialogic System Software and choose Dialogic Configuration Manager.

    Note: If a message displays indicating that devices could not be detected, click OK. Stop the Dialogic service using the red stop button.

  4. Double-click the icon for the voice card. For multiple cards, repeat the following steps for each card in the system.

  5. Click the MISC tab.

  6. From the Parameter menu, select Parameter File.

  7. If there is an existing QuietXX.PRM file, note the file name. If there is not an existing prm file, enter Quiet50.prm in the Value field.

  8. Choose the Apply button and click OK.

  9. Repeat Steps 4 through 8 for each additional card.

  10. Close the Dialogic Configuration Manager.

  11. Use Notepad or Wordpad to open Quiet50.prm (or the QuietXX.prm file being used). This file is located in C:\Program Files\Dialogic\Data.

    12. Below is a sample Quiet50.prm file.

    
!--- QUIET50.PRM
!--- Silence Threshold = -50 dBm 
!--- This is the Dialogic parameter file used with DNA2 for Windows NT.
!--- Created on July 20, 1998 BC.
!--- Original values based on parameter files.
!--- last qualified with SR4.11 for OS/2 using D4X.FWL
!--- version 2.70. 9/22/95 MA 

  
AREA=VOICE
SIZE=WORD
BASE=DECIMAL


PARAM 111 : 16039 
PARAM 112 : 76
PARAM 11  : 57296  !--- Playback Volume low word
PARAM 12  : 43     !--- high word, set to 
PARAM 22  : 40201  !--- AGC window low word
PARAM 23  : 2      !--- high word 
PARAM 42  : 62165  !--- AGC minimum average low 
PARAM 43  : 38264  !--- high word
PARAM 44  : 45585  !--- AGC slope after attenuation 
PARAM 45  : 65535  !--- high word
PARAM 46  : 43     !--- AGC attenuation threshold 
PARAM 47  : 0      !--- high word
PARAM 48  : 57296  !--- Playback Volume Cap low 
PARAM 49  : 43     !--- high word, set to -11.5dbm
PARAM 77  : 6      !--- Signal to noise ratio
PARAM 67  : 18227  !--- Silence threshold low word
PARAM 68  : 0      !--- Silence threshold hi word
  12. Save a backup copy of this file before making any changes.

  13. Add the following value: 
    PARAM 56  : 3      !--- Offhook Delay

    Parameter 56 is the off-hook delay. In this case the parameter is set to three. This setting represents 30 milliseconds (.3 second).

    14. Note: Parameter settings do not need to be set in numeric order.

  14. Reboot the PC to be sure the new settings take effect.

Tools Information

For additional resources, refer to Cisco TAC Tools for Voice, Telephony and Messaging Technologies.

Related Information

Toolbar

All contents are Copyright © 1992--2002 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.

Updated: Dec 12, 2002Document ID: 5213