Programmatic Call Control

Comprehensive, granular call flow administration via API.

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Carrier Control

Cut out intermediaries and interface directly with core carrier systems.

Resilient Service

Anycast IP built on our global, private network for top-tier performance.

Massive Scale

We support large deployments through automated scaling and low latency requests.

Manipulate the Call Flow

Next-generation applications that embed voice communications require highly responsive call systems and granular control over every leg of the call. Use Telnyx Call Control to:

Answer, transfer and end a call
Play recorded messages
Record a call
Gather a series of DTMF dial pad responses
Fork call media to multiple destinations

Top-Tier Performance and Security

The anycast architecture of Telnyx Call Control minimizes the distance requests and callbacks travel on the public internet, reducing latency and improving security. By leveraging our global, private network, the Call Control service is highly performant, and automated failovers and rerouting keeps the service up around the clock—no matter the volume.

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Programmatic Media Forking

Telnyx is the first carrier to offer programmatic call forking. For any call, natively duplicate and deliver the media stream to multiple recipients via API.

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Call Control API

The Telnyx Call Control API consists of commands that tell our system to begin or end certain functions and callbacks that notify your system of call changes or caller actions.

Commands include:

Answer, transfer and hangup
Play audio
Gather DTMF
Record call
Fork call media

Callback notifications include:

Call initiated, answered, transferred and hung up
DTMF response and DTMF gather ended
Playback started and ended
Recording saved

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// Gather DTMF (key presses)

curl -X POST \
  --header "Content-Type: application/json" \
  --header "Accept: application/json" \
  --user API_KEY:SECRET \
  --data '{
    "audio_url": "http://www.example.com/audio/greeting.mp3",
    "min": 1,
    "max": 8,
    "tries": 3,
    "timeout": 10,
    "terminating_digit": "#",
    "valid_digits": "12345",
    "inter_digit_timeout": 10,
    "invalid_audio_url": "http://www.example.com/audio/invalid.mp3"
  }' \
  "https://api.telnyx.com/calls/{call_control_id}/actions/gather"