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The Call Tab in Agent Studio controls call lifecycle limits, silence detection, telephony routing, and caller identification for voice interactions.

Overview


Max Call Duration

  • Maximum call duration: Sets the maximum allowable runtime for any single call session handled by the agent.
  • Allowed range and unit: Specified in seconds (e.g., 90 for 1.5 minutes, 300 for 5 minutes, 1800 for 30 minutes). Supported range is 10 to 3600 seconds (up to 60 minutes).
  • What happens when the limit is reached: When the active call duration reaches this limit, the platform automatically and gracefully terminates the call.
  • Why it matters: Protects against runaway calls, infinite loops, and unexpected billing charges from dropped caller connections.

Silence Timeout

  • What counts as silence: Any period during a call where the Voice Activity Detection (VAD) engine detects no human speech input. Ambient background noise is automatically filtered out.
  • When the timer starts: The silence timer starts (and resets) immediately after the agent finishes speaking and is waiting for a response from the caller, or during pauses between caller conversational turns.
  • What happens after timeout: If the caller remains silent for longer than the configured timeout, the agent automatically ends the call session to free the telephony channel.
  • Allowed range and unit: Configured in seconds (supported range: 5 to 60 seconds; default is 10 seconds).

Telephony Provider

  • Supported providers:
    • Twilio — Global carrier connectivity and high reliability.
    • Plivo — Cost-effective voice routing, especially for India and APAC destinations.
    • Acefone — Enterprise cloud telephony and virtual PBX routing.
  • How to configure and select:
    • Tenant Default: Automatically inherits the default telephony provider configured in your organization’s Integrations.
    • Explicit Selection: Choose a specific provider from the dropdown to route calls for this particular agent through a dedicated account.

Caller ID

  • Purpose: The phone number presented as the caller identity (CLI) on the recipient’s phone screen during outbound calls and automated campaigns.
  • Source of the number: Sourced from verified numbers purchased or registered under the Phone Numbers section.
  • Requirements:
    • Must be a valid phone number in standard E.164 format (e.g., +14155552671 or +919876543210).
    • Must be verified or owned under your connected telephony carrier account (see Caller ID Verification).
  • Outbound-call behavior: The carrier transmits this number in SIP signaling headers, displaying it to the callee. Inbound calls returning to this number route directly to the assigned agent.

Integrations

How telephony credentials and phone numbers are connected to the agent:
1

Connect Provider Credentials

Go to Integrations in the dashboard and add your telephony credentials (e.g., Twilio Account SID and Auth Token, or Plivo Auth ID and Auth Token). Credentials are automatically validated upon saving.
2

Add and Verify Phone Numbers

Go to Phone Numbers to buy numbers directly through your connected carrier or verify existing company numbers for outbound Caller ID use.
3

Bind to Agent in Call Tab

Open your agent in Agent Studio, switch to the Call Tab, and choose the Telephony Provider and verified Caller ID. Save your changes.

Configuration Example

Complete Call Tab Configuration

Below is an example of a complete Call Tab configuration:

Expected Call Behavior

  • Outbound Caller Display: The callee sees +14155550199 on their incoming call screen.
  • Silence Handling: If the conversation ends and the callee doesn’t hang up, the agent waits 10 seconds of silence before automatically hanging up.
  • Duration Limit: If the call exceeds 300 seconds (5 minutes), the session is terminated automatically to prevent open-line billing.