OfficeSIP Messenger provides enterprises with advanced instant communications for free. Compatible with Office Communications Server 2007, OfficeSIP Messenger delivers reliable performance combined with trouble-free deployment and management. Supporting text, voice and video chats, the free softphone implements ICE, STUN, and TURN protocols to easily traverse NAT and firewalls, and supports TLS for ultimate communication security. Unlike other enterprise instant messengers and communicators, OfficeSIP Messenger is entirely server-based, allowing administrators to enter, store and modify all settings, configurations, and user profiles on a corporate server.
Windows Server 2008,
||Microsoft .NET Framework 3.5 SP1