-The O-RAN SC external server is an extension for Near-RealTime RIC simulator. It creates an external web server building RESTful API. It is capable of recieving Rest calls from the northbound simulator version STD_2.0.0 and responses back to it.
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-The details of API definitions are being explained below:
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-See `Callout server API <./EXT_SRV_api.html>`_ for full details of the API.
+The O-RAN SC external call-out server allows behavioral extensions to be added to the A1 Simulator. It creates an external call-out server, which provides a RESTful API. A1 Policy operations, for some A1 Policy Types, can then be redirected to the external call-out server, supporting supplemental simulator behavior for those A1 Policy Types.