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What is the Call Tab?

The Call Tab is where you configure how your agent handles phone calls. Set up your telephony provider, enable call features like noise cancellation and voicemail detection, and manage call timing and hangup behavior.
Call Tab showing Plivo telephony provider, Noise Cancellation at 70, Voicemail Detection, Keypad Input DTMF, Auto Reschedule toggles, and Outbound call timing restrictions with 9 AM to 9 PM window

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Configuration Options

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Telephony Provider & Call Features

Configure your telephony provider and toggle powerful call capabilities.
Telephony Provider dropdown, Noise Cancellation, Voicemail Detection, Keypad Input DTMF, and Auto Reschedule toggles

Noise Cancellation

Filter background noise for clearer calls (adjustable intensity)

Voicemail Detection

Detect voicemail systems to avoid awkward messages

Keypad Input (DTMF)

Accept touch-tone input for IVR-style menus

Auto Reschedule

Automatically retry failed calls later
Connect your own telephony provider in Providers for more control and cost savings.

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Ambient Noise

Add background ambient noise to your calls for a more natural, human-like experience. Ambient noise is available for Plivo and Vobiz telephony providers.
Ambient Noise dropdown with coffee-shop, office-ambience, and call-center options
Bolna supports both preset and custom ambient noise tracks. Select a preset or upload your own custom track to use as background noise during calls.

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Preset Tracks

Three preset tracks are available to all users out of the box:
TrackDescription
Coffee ShopBackground sounds of a coffee shop environment
Office AmbienceSubtle office background noise
Call CenterCall center ambient sounds
Set ambient noise to None to disable it (default).

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Custom Tracks

You can upload your own custom ambient noise tracks for a personalized experience:
  • Supported formats: wav, mp3
  • Maximum file size: 10 MB
  • You can upload, list, and delete your custom tracks from the dashboard or via the API
  • Custom tracks are private to your account, while presets are available to everyone
Ambient noise is only supported with Plivo and Vobiz telephony providers.

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Final Call Message

Configure the last message your agent says before disconnecting.
Final Call Message section with language selector and message input field
1

Select Language

Choose the language for your final message (supports multi-language).
2

Write Your Message

Enter a warm, professional closing (e.g., “Thank you for your time. Goodbye!”)
3

Add Languages (Optional)

Click + Add to include final messages in other languages.
A warm, professional final message leaves a positive lasting impression on callers.

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Call Management

Configure how and when calls should end.
Call Management section with Hangup on User Silence and Total Call Timeout sliders
SettingDescriptionRecommended
Hangup on User SilenceAuto-hangup after X seconds of silence6-10 seconds
Total Call TimeoutMaximum call duration in seconds300s (5 min) for support, higher for sales
Set reasonable timeouts to manage costs and prevent stuck calls. Very long calls can indicate issues or abandoned calls.

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Outbound Call Timing Restrictions

Restrict outbound calls to a specific time window. This is off by default. Toggle it on to set an allowed calling window.
Outbound call timing restrictions section with toggle enabled and Allowed Time Window set from 9:00 AM to 9:00 PM
FieldDescription
Allowed Time WindowSet a start and end time (e.g., 9:00 AM to 9:00 PM). Calls outside this window are automatically rescheduled to the next allowed time.
The time window is validated against the recipient’s local timezone, detected automatically from their phone number. For example, a 9 AM start means 9 AM in the recipient’s timezone, not yours.
Many regions have laws restricting when you can make outbound calls. Enable timing restrictions to stay compliant with local regulations.
You can also configure call timing restrictions via the API and bypass them for urgent calls. See the full Calling Guardrails guide for details.

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Next Steps

Calling Guardrails

Set allowed hours, bypass rules, and compliance

Engine Tab

Configure latency and interruptions

Tools Tab

Add function tools and APIs

Telephony Providers

Connect Twilio, Plivo, or Exotel