> For the complete documentation index, see [llms.txt](https://doc.opentact.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.opentact.org/opentact-api-documentation/calling.md).

# Calling

Opentact provides a set of call command API to let developers to make outbound calls.  When the outbound call is answered, the call will be handled by using Opentact Call XML. 

Opentact support the following Call Control Command:

* Make single Calls
* Make bulk Calls
* Bridge two calls together