Tuesday, April 1, 2008

Protocols - OCS Web Conferencing

Conference Protocols

Office Communications Server 2007 multimedia conferencing uses a variety of protocols for signaling, conference management, data collaboration, multimedia, and communication among conference components.

SIP (Session Initiation Protocol). An IETF (Internet Engineering Task Force) standard signaling protocol for initiating, managing, and terminating sessions between one or more participants, including Internet telephone calls, multimedia distribution, and multimedia conference sessions.

HTTP (Hypertext Transfer Protocol). A standard Internet protocol that in Office Communications Server 2007 is for communication between the Focus and conferencing servers, downloading Address Book Server updates to clients, and downloading meeting content to users.
C3P (Centralized Conference Control Protocol). A custom protocol for communicating conference creation and control commands from clients to Office Communications Server 2007. C3P commands are carried as XML in SIP SERVICE or INFO messages.

PSOM (Persistent Shared Object Model). A custom protocol for transporting Web conferencing content.

SRTP (Secure Real-Time Transport Protocol). An IETF standard protocol that is used in Office Communications Server 2007 for securely transporting audio and video content to various media devices.

RTCP (Real-Time Control Protocol). An IETF standard protocol used in conjunction with SRTP to convey information about the signal quality of an audio-video conferencing session to various media devices.

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