# Outbound calls

Initiate outbound calls through the Voximplant infrastructure: a callback that connects an operator and a client, automated informational calls with speech synthesis or with playback of an audio file.

Bitrix24 API: `voximplant.callback.start`, `voximplant.infocall.*`
Scope: `telephony`

## Operations

- [Callback](./outbound/callback.md) — `POST /v1/calls/callback`
- [Auto-call with speech synthesis](./outbound/auto-call.md) — `POST /v1/calls/auto-call`
- [Auto-call with an audio file](./outbound/auto-call-audio.md) — `POST /v1/calls/auto-call-audio`

## Typical scenario

1. Get the list of available lines: [`GET /v1/voximplant-lines`](./lines/voximplant.md).
2. Pick `fromLine` from the response.
3. Initiate a call via one of the three endpoints above.
4. After the call ends, a record appears in the [statistics](./analytics/statistics.md) with type 4 (callback) or 5 (informational).

## See also

- [Telephony — overview](../telephony.md)
- [Lines](./lines.md) — source of `fromLine`
- [Voices reference](./analytics/voices.md) — for the `voice` parameter in an auto-call with speech synthesis