Ribbit, which was recently acquired by BT, today rolled out its developer platform out of beta at the Adobe Max conference. Ribbits extensive APIs allow you to integrate voice communications into business applications such as Salesforce.com, CRM systems, call center applications, and even social networks. 
Ribbit launched its programming platform for developers today at the Adobe Max conference. Ribbit likes to call themselves "Silicon Valley's First Phone Company". Post-acquisition, BT and Ribbit are taking the platform public with "Bring Your Own Network" which they claim is a telecom industry first. Ribbit said, "Carriers around the globe can tap into the power of the Ribbit platform and active developer community, to create new revenue streams and provide their customers with more choice and function through innovative voice-enabled applications."
As seen by the charts above, Ribbit has extensive support for industry standards, including SIP, XMPP, XML, Flash, and more. When I spoke with Ribbit Ribbit CEO Ted Griggs he compared their software platform to Amazon's cloud computing, enabling programmers to build powerful integrated telephony applications for Web sites. A proprietary softswitch (the Ribbit SmartSwitch) mediates communication across protocols, networks and devices. That includes MSN Messenger, Google Talk, Yahoo! Messenger and Skype. As I have previously written, the Ribbit API functions include call control, authentication, billing, messaging, and more. The Ribbit API abstracts the protocol inter-communication between MSN Messenger, Google Talk, and even Skype. Ribbit has reverse-engineered the Skype protocol to provide the ability for Skype users to receive calls from MSN Messenger users, Yahoo! Messenger users and Google Talk users by leveraging the Ribbit SmartSwitch.
Their most famous application to date is their use of the Ribbit API to integrate with Salesforce, a popular hosted CRM application. Also, Oracle On Demand support in Q1 2009 is forthcoming. Ribbit told me they've done a lot of work to simplify and automated the process to make it easier for developers to get started. They explained you can sign up, access the APIs and documenation, and play with them for 'free' in a sandbox before deploying and charging for the applications. When I asked if the highly successful iPhone apps sold by third parties on the Apple Store was a good analogy for their applications being developed and sold by developers they agreed that was an appropriate analogy.
BroadSoft and Sylantro Systems are two of the first VoIP providers to leverage the Ribbit platform, which Ribbit now claims has 7,500 developers.
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They haven't reverse-engineered skype protocol
Just using gateway, the same way as others put skype to SIP for example... Skype protocol hasn't been reverse engineered yet.