VICIdial Wait for Silence: Complete Optimization Guide

Quick Reference

Setting Name

wait_for_silence

Default Value

0

Recommended

1000 to 2000ms for most AMD configurations

Impact Level

Medium

Location in VICIdial

Admin > Campaigns > [Campaign] > AMD Settings

What Wait for Silence Does

The number of milliseconds of silence VICIdial waits for after a call connects before attempting AMD analysis. Setting this too low means AMD starts analyzing mid-greeting; too high delays AMD decision and adds latency to agent call delivery.

Center Size Recommended Value Notes
10–25 Agents 1000 to 2000ms for most AMD configurations Start conservative, monitor for 48 hours before adjusting
25–100 Agents 1000 to 2000ms for most AMD configurations Scale gradually — larger operations amplify effects of misconfiguration
100–500 Agents 1000 to 2000ms for most AMD configurations Consult ViciStack optimization team for enterprise-scale tuning

How to Change This Setting

  1. 1 Navigate to Admin > Campaigns
  2. 2 Select campaign
  3. 3 Find Wait for Silence field
  4. 4 Enter milliseconds (e.g., 1500)
  5. 5 Tune based on AMD accuracy results
  6. 6 Monitor AMD false positive/negative rates after changes
  7. 7 Submit

Common Problems

Value of 0 causes AMD to analyze immediately — high false positive rate

Values over 3000ms add noticeable delay to call connection

Must coordinate with call_timeout and dial_timeout values

amd_send_to_vmx AMD Send to Voicemail Extension Campaign call_timeout Call Timeout Campaign dead_trigger Dead Trigger Campaign amd_type AMD Type Campaign

ViciStack Module

How ViciStack Optimizes Wait for Silence

ViciStack's AMD Optimization module automatically monitors and optimizes wait_for_silence based on real-time performance data from your operation. Instead of manual tuning, ViciStack continuously analyzes call outcomes, agent performance, and contact rates to recommend and implement optimal values — often catching configuration drift before it affects your numbers.

Learn About AMD Optimization →

Frequently Asked Questions

What does wait_for_silence do in VICIdial? +
The number of milliseconds of silence VICIdial waits for after a call connects before attempting AMD analysis. Setting this too low means AMD starts analyzing mid-greeting; too high delays AMD decision and adds latency to agent call delivery.
What is the recommended value for wait_for_silence? +
The recommended range for wait_for_silence is 1000 to 2000ms for most AMD configurations. The out-of-box default is 0. Note that optimal values vary by operation size, campaign type, and carrier — use ViciStack's automated tuning to find your exact optimal configuration.
Can ViciStack automatically optimize wait_for_silence for me? +
Yes. ViciStack's AMD Optimization module monitors wait_for_silence continuously and alerts you when the value drifts outside optimal range. On qualifying plans, ViciStack can automatically adjust this setting based on real-time performance data — no manual intervention required.

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