> For the complete documentation index, see [llms.txt](https://help.sipgate.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sipgate.de/cloud-telefonanlage/en/connections-and-integrations/api.md).

# 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 – features, pricing, 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 limit 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.


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