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Business-to-Business Unified Communications

Cisco Intercompany Media Engine provides a revolutionary way for organizations to extend their Cisco Unified Communications experience to their business partners or customers, delivering feature-rich interoperability via boundaryless collaboration as well as cost savings.
This worldwide, peer-to-peer network offers these features:

• Lets partners use calling features that are available between clusters (except extension mobility)
• Learns new routes, through calls to any business partner who participates in the Cisco Intercompany Media Network
• Offers encrypted signaling and media for all Intercompany media engine calls between partners
• Provides a high level of security, plus spam blocking, to help prevent mining for callable numbers belonging to your enterprise
• Reduces gateways and overhead, by moving calls from PSTN to direct SIP trunks over the Internet or an extranet

http://www.youtube.com/watch?v=u4GPWhRgHE0

http://www.youtube.com/watch?v=mJHWNKB7vy4