Zernio
Zernio
API Reference

Voice & Calling

Calls

List phone callsGETPlace an outbound phone callPOSTGet a phone callGETHang up a live callPOSTBlind-transfer a live callPOSTGet a call recordingGETEstimate call costGET

Browser Softphone

Mint a browser softphone sessionPOSTDial from the browser softphonePOST

Number Setup

Enable phone calling on a numberPOSTDisable phone calling on a numberDELETEAttach a number to a SIP trunkPOSTDetach a number from its SIP trunkDELETE

SIP Trunks

List SIP trunksGETCreate a SIP trunkPOSTGet a SIP trunkGETDelete a SIP trunkDELETERotate a SIP trunk's passwordPOST
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Voice & Calling

Rotate a SIP trunk's password

Mints a new digest password on the trunk. The old password stops working immediately, so update the destination platform right away.

POST
/v1/phone-numbers/sip-trunks/{id}/rotate-credentials

Authorization

bearerAuth
AuthorizationBearer <token>

API key authentication: send your Zernio API key in the Authorization header, prefixed with Bearer.

In: header

Path Parameters

id*string

Response Body

application/json

application/json

application/json

{  "termination": {    "uri": "string",    "username": "string"  },  "digestPassword": "string"}
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Delete a SIP trunk

Tears down the trunk and its carrier-side objects. Refused while any number is still attached: detach them first.

Send an SMS/MMS

Sends an SMS (or MMS when `mediaUrls` is set) from one of your SMS-enabled numbers. At least one of `text` / `mediaUrls` is required. Both numbers are normalized to E.164, so `from` matches regardless of formatting and replies thread into the same inbox conversation. US numbers must have an approved carrier registration (`/v1/sms/registrations`) before messages deliver. **Replies and delivery status arrive as webhooks**, not by polling: an inbound reply fires `message.received` with `platform: "sms"`, the first message of a new thread also fires `conversation.started`, and this message's own outcome fires `message.delivered` or `message.failed` (the latter carrying the carrier's error code). **Opted-out recipients:** a send to a number that replied STOP is refused with `409`, never silently dropped. **Idempotency:** send an `Idempotency-Key` header to make retries safe: same key + same body replays the original response instead of sending a second message; same key + different body returns 422; a key still in flight returns 409.