# What is the sipgate API and what functions does it offer? {% hint style="info" %} **Note:** This feature is only available to customers on **sipgate classic** . On sipgate neo, the feature is integrated in a different form. {% endhint %} The sipgate API (Application Programming Interface; German: program interface) provides **functionality** of the sipgate platform **for external applications** . The sipgate API offers functions from the following areas: * Establishing telephone calls * Sending SMS * Sending and receiving fax messages * Retrieving credit information * Access to the event list (data on calls, fax messages, voicemails, and SMS) * Access to voicemails * Provisioning data for VoIP endpoints In addition, information such as sender, recipient, and timestamp is generally available for all items in the event list. Furthermore, for **voicemail, fax, and SMS** for example, the contents can be downloaded as a file. All information about the sipgate API is bundled and documented in detail on the [sipgate.io](https://www.sipgate.io) homepage. **Who do I contact if I have problems with the sipgate API?** If you have questions about the REST API and the sipgate.io push API, please contact our developer team directly. You can reach us * by email at As a discussion platform for developers, we have a [**mailing list**](http://groups.google.com/group/sipgate-api) set up where you can sign up. --- # 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/was-ist-die-sipgate-api-und-welche-funktionen-bietet-sie.md?ask= ``` 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.