Video-Conferencing Support
The Net-Net Session Director (NN-SD) supports H323 video-conferencing environments using the H239 Procotol for video-conferencing. It provides critical control functions to enable high quality interactive communication—voice, video and multimedia sessions—across IP network borders.
For additional information about the H323 Protocol, see the Net-Net 4000 ACLI Configuration Guide, Version 6.3.
The NN-SD architecture supports both voice and video applications. It uses Codec Media Profiles to determine the proper amount of bandwidth allocated for a given session, distinguishing between G.711 or G729 voice and H.263/264 video requirements. By supporting video transmission as well as voice over the IP Multi-protocol label switching (MPLS) core, the NN-SD allows Service Providers to roll out new services to their enterprise customer such as video/audio conferencing.
Note:
IP MPLS is a packet-switched network that uses the Internet Protocol (TCP/IP) enhanced with the Multi-protocol label switching (MPLS) standard.The NN-SD allows for aggregate bandwidth policies to be configured for each realm. As the NN-SD processes call requests (to and from) a particular realm, the bandwidth consumed for the call is decremented from the bandwidth pool for that realm. The SD determines the required bandwidth from the SDP/H.245 information. Any request that would cause the bandwidth constraint to be exceeded is rejected with a SIP “503 Service Unavailable” or an H.323 Release Complete.
To alleviate the bandwidth demands of high-definition video streams, the NN-SD offers a 2 or 4 Gigabit PHY card option.