Module a.callcontrol

Call Control - a thin layer on top of the Aculab API.

See callin.py for an example how to use this module.

Terminology: what is called a 'call' in this module should be called a 'call leg' according to international treaties, but in Aculab's nomenclature, it's a call, so we stick with that.

Class	CallHandleBase	Base class for Call Handles.
Class	CallHandle	An Aculab call handle, and common operations on it.
Class	Call	A Call is a CallHandle that does an automatic openin upon