# API

- [What changes with the new system in the sipgate REST API and sipgate.io?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/was-aendert-sich-mit-dem-neuen-system-in-der-sipgate-rest-api-und-bei-sipgateio.md): An overview of all changes to the sipgate REST API and sipgate.io after the switch to the new sipgate Neo system.
- [What is the sipgate API and what functions does it offer?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/was-ist-die-sipgate-api-und-welche-funktionen-bietet-sie.md): Overview of the sipgate API – control functions such as calls, SMS, fax, voicemails, and event lists via the interface.
- [What API offerings does sipgate provide?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/welche-api-angebote-bietet-sipgate-an.md): Overview of the sipgate REST API and Push API – range of functions, prices, and possible uses for your telephony.
- [How can I manage API clients and webhooks?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/wie-kann-ich-api-clients-und-webhooks-verwalten.md): Guide to managing OAuth2 API clients and sipgate.io webhook server addresses in the API console.
- [What is authentication using a Personal Access Token?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/was-ist-die-authentifizierung-mittels-eines-personal-access-tokens.md): Learn how to create and manage Personal Access Tokens for secure authentication with the sipgate REST API.
- [How do I send SMS with the sipgate API?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/wie-versende-ich-sms-mit-der-sipgate-api.md): Guide to sending SMS via the sipgate REST API, including character limits and sender number verification.
- [What is sipgate.io?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/was-ist-sipgateio.md): Overview of sipgate.io – the APIs for SMS, fax, call control, and CRM integration.
- [What is the difference between sipgate API and sipgate.io?](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api/was-ist-der-unterschied-zwischen-sipgate-api-und-sipgateio.md): Learn the difference between the sipgate REST API and the Push API as well as their use cases and costs.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.