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At INFN-CNAF are located three different conferencing systems:

The Codian H.323 MCU 4200 that delivers 20 Audio/Video voice ports.

Supports all the most common Audio and video formats and recently also HD up to 720p H.263 15fps continuous presence or 448p 30 fps, together with comprehensive HD audio support.
The MCU allows to stream video conferences, audio and content to web browser. For other infos click here
The INFN Codian MCU supports now the SIP protocol allowing all SIP clients to join a conference.

The Polycom MGC 50 up to 12 Simultaneous users connected in H.320, H.323 and PSTN

Supports most common Audio ancd Video formats is fully compatible with H.320 (Via a Primary ISDN), H.323 (IP) and PSTN (phones and mobile phones) clients.
This MCU is used for Scheduled and attended conferences in Dial OUT mode.

The phone conference system based on Asterisk software

It supports a wide range of protocols for the handling and transmission of voice over traditional telephony interfaces including H.323, Session Initiation Protocol (SIP) and  the Inter-Asterisk eXchange (IAX).

This system permits to host phone conferences with no theoretical user limit via IP (SIP/ IAX) and PSTN (phones and mobile phones).

Asterisk is a open source/free software implementation of a telephone private branch exchange (PBX) originally created by Mark Spencer of Digium.

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