.. _extension-main:

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Extension
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An extension is an internal SIP endpoint (e.g., ``1001``) that registers agents or devices to the VoIPBin platform for making and receiving calls.

**API Reference:** `Extension endpoints <https://api.voipbin.net/redoc/#tag/Extension>`_

.. toctree::
   :maxdepth: 2

   extension_overview
   extension_struct_extension
   extension_tutorial