API and webhooks
The API mirrors the features of the account: numbers, calls, recordings, SMS, contacts, HLR update and statistics. Webhooks send events to your URL, so your internal system learns about a call while it is still in progress.
What is included
- API keys you can disable, reissue and delete
- Method documentation in Scalar without registration
- Webhooks: call start, ringing, answer and end
- Webhooks: incoming, delivered and unsent SMS
- Webhooks for voicemail and the end of an AI call
- HMAC-SHA256 request signature in the X-A3-Signature header
- Protection against sending to internal network addresses
- Outgoing AI call through the API
Included in your A3.Telephony subscription. Calls, SMS and number rental are paid from your balance as used. How the cost is calculated
FAQ
How do I verify that a webhook came from A3.Telephony?
Each request is signed with HMAC-SHA256 using the subscription secret, and the signature is in the X-A3-Signature header. Compare it with the signature of the request body on your side.
Where can I see the API methods?
The documentation is open in Scalar via the link on the API page, and no registration is needed to read it.
Other features
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