def __init__(self, api_url='http://localhost:8088/stasis'):
"""Initiate new AsteriskPy instance.
Takes optional string api_url which points to the REST API base URL.
Raise requests.exceptions
"""
self._api_url = api_url
self._api = AsteriskRestAPI(uri=self._api_url)
self._asterisk = Asterisk(self._api)
