Polycom has expanded its VoIP Interoperability Partner (VIP) Program for manufacturers of SIP-based call control platforms with the addition of six newly certified members: Cedar Point Communications, LignUp, MetaSwitch, PanTerra Networks, Sutus, and Zultys. Polycom now recognizes a total of 25 leading VoIP platform providers as certified members who deliver solutions that seamlessly interoperate with the Polycom SoundPoint IP desktop and SoundStation IP conference phones. http//www.polycom.com/vip