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

Disable phone calling on a number

Turns off PSTN calling for the number. The stored forward destination and settings are preserved, so re-enabling restores the prior config.

DELETE
/v1/phone-numbers/{id}/voice

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

import Zernio from '@zernio/node';const zernio = new Zernio({ apiKey: process.env.ZERNIO_API_KEY });const { data } = await zernio.voice.disableVoiceOnNumber({  path: {    id: 'abc123',  },});console.log(data);
{  "enabled": true,  "phoneNumber": "string"}
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Enable phone calling on a number

Turns on regular phone (PSTN) calling for one of your numbers and configures how inbound calls are handled. Inbound calls route to `forwardTo`: your own AI voice agent (Vapi/Retell), a phone, or a SIP endpoint. Optional extras: voicemail, business-hours windows, an IVR menu, a caller blocklist, recording, and transcription. A number can also be voice-enabled with no forward (outbound-only). Idempotent, and doubles as the settings update: only fields present in the body are written. Omitting `forwardTo` preserves the current destination; sending an empty string clears it.

Attach a number to a SIP trunk

Routes the number's calls to the trunk: the external platform receives its inbound directly and can present it as outbound caller ID. While attached, Zernio-side voice features are off for this number (call forwarding, IVR, voicemail, recording, the softphone, and WhatsApp calling), so the number must have Calls and WhatsApp calling disabled before attaching. SMS and WhatsApp messaging are unaffected.