OpenSky service

OpenSky was a service provided by Gizmo5, which is now out of business, to enable communication between users of SIP and users of Skype.
Early solutions to communication between the two classes of user typically required installation of a gateway.
OpenSky – the first freely available hosted SIP to Skype gateway service – commenced on 9 February 2009.
In March 2009 Skype announced a beta of Skype For SIP, a comparable service for business users.
On 30 July 2009 Digium, Inc. announced the opening of Skype for Asterisk Public Beta . The download was available until 7 August 2009 and scheduled to expire on 30 August 2009.