kbps, but it also supports 6.4-kbps and 11.8-kbps rates. In addition, it supports voice-activity detection and comfort-noise generation. Video conferences are too important for our customer. For video codec we chose the default H.261. This standard, developed in 1990, was the first widely used video codec. It introduced the idea of segmenting a frame into 16 3 16 "macroblocks" that are tracked between frames to establish motion-compensation vectors. It is mainly targeted at videoconferencing applications over ISDN lines (p 3 64 kbps, where p ranges from 1 to 30). Input frames are typically CIF (352 3 288) at 30 frames-per-second (fps), and output compressed frames occupy 64 kbps to 128 kbps for 10-fps resolution. -6- Configuration We need to configure our equipment for work. The most important part here is the configuration of Asterisk PBX stations.
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