[OpenSIPStack] [ATLSIP] USB phone support

[Ilian J. C. P. <ip...@so...>]

Hello.

I have checked in code for USB phone support.

The relevant classes are:

HidManager - Manages all HIDs (i.e. USB phones) and sends events to the 
handlers.
HidHandler - Handles/listens for events from HidManager. Override this 
to provide custom actions in response to events. HidDevice - Override 
this to implement a USB phone interface. This is where the USB phone SDK 
code should go.

The relevant files are:

Hid.cxx/h - base code for USB phone support
CmHidDevice.cxx/h - the ATCOM USB phone interface implementation.

This is currently implemented in the OSSPhoneSvc project under ATLSIP 
but it should also be trivial to do the same to OSSPhone .NET and 
OSSPhone MFC. Will do this later.

For now, only ATCOM USB phones are supported. To enable this, you will 
need to request a copy of the SDK from ATCOM (http://www.atcom.cn/). 
Then put all relevant files (i.e. cm_hid.*) in the 
opensipstack/external/hid folder and then do a rebuild.

Regards,
Ilian