OpenSky was a service provided by Gizmo5, which is now out of business, to enable communication between users of SIP (Internet standard RFC 3261[1]) and users of Skype (which uses a proprietary protocol).[2]
Early solutions to communication between the two classes of user typically required installation of a gateway.[3]
OpenSky – the first freely available hosted SIP to Skype gateway service[4] – commenced on 9 February 2009.[5]
In March 2009 Skype announced a beta of Skype For SIP, a comparable service for business users.[6][7]
On 30 July 2009 Digium, Inc. announced the opening of Skype for Asterisk Public Beta[8] (prior to the open phase, from 25 September 2008, Skype for Asterisk Beta was apparently non-open[9]). The download was available until 7 August 2009 and scheduled to expire on 30 August 2009.[10][11]
^"RFC 3261 - SIP: Session Initiation Protocol". February 2002. Retrieved 15 August 2009.
^Comparison of VoIP software
^"SIP to Skype Gateway – SipToSis – SIP to Skype Bridge". Retrieved 16 August 2009.
^CEO of Gizmo5 response to Mashable readers' comments under "Gizmo5 Launches OpenSky, Free Service to Call Skype From Any VoIP Phone". The GigaOM Network. 10 February 2009. Retrieved 15 August 2009.
^"Building a Bridge to Skype Island with OpenSkyXX". 9 February 2009. Retrieved 15 August 2009.
^"Skype opens up to corporate SIP communications - About Skype". 23 March 2009. Retrieved 15 August 2009.
^"Skype For SIP now available in Beta - Skype for Business". 23 March 2009. Retrieved 15 August 2009.
^"Skype for Asterisk: Public Beta available". Retrieved 16 August 2009.
^"Skype for Asterisk Beta – Skype Blogs". 25 September 2008. Retrieved 16 August 2009.
^"Skype for Asterisk Beta Limited Time Offer". VoIP Tech Chat. Retrieved 16 August 2009.
^"Graves On SOHO VoIP » Skype For Asterisk Open Beta Now Available". Retrieved 16 August 2009.
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