# API Reference

Everything you can do with SIP trunking in the [dashboard](https://voice.izt.cloud) is backed by an API, and programmatic access is available for building your own automation and monitoring. This page is a short orientation; the full endpoint-by-endpoint reference is being prepared.

## What you can do

- **Trunks & numbers**: create and manage [trunks](/sip/trunks/create/) and configure [number routing](/sip/routing/inbound/).
- **Live statistics**: pull per-trunk call/traffic stats and registration status, the same data shown in the dashboard (see [CDRs & Call Troubleshooting](/sip/cdrs/)).
- **Fax**: submit outbound faxes and track their status (see [Faxing over SIP](/sip/fax/)).

For push-based integration instead of polling, see [Webhooks & Events](/sip/webhooks/).

## Authentication

API access is tied to your Cloud Voice account, the same account you use to sign in at [voice.izt.cloud](https://voice.izt.cloud). Requests are authorized against that account, and you can only see and manage the trunks and numbers that belong to it.

*Credential setup steps coming soon.*

## Good practices

A few things that hold regardless of the endpoint details:

- **Treat the dashboard as the reference behavior.** The API enforces the same rules the dashboard does, for example, a trunk can't be deleted while numbers still route to it, and caller ID overrides must be numbers your account owns.
- **Phone numbers are E.164.** Send and expect numbers in `+1XXXXXXXXXX` form.
- **Prefer webhooks over tight polling loops** for registration, call, and fax status, see [Webhooks & Events](/sip/webhooks/).
- **Keep credentials out of client-side code.** API access carries the same authority as your dashboard sign-in.

## Full reference

*The complete endpoint reference, request/response schemas, error codes, and examples, is coming soon.*

:::tip[Need something today?]
If you have an integration blocked on API details, contact [support](https://voice.izt.cloud/support) and we'll get you the specifics for your use case.
:::