Call Manager 4.X supports video calls between SCCP and H323 endpoints. Call Manager can support point-to-point video calls between endpoints and if you want to enable the conferencing features then you need to use a Multioint Control Unit (MCU).
Standard voice point-to-point calss involve two RTP streams, and video calls can involve up to six streams. 2 RTP streams for Audio, 2 RTP streams for Video and 2 RTP streams fro Far End Camera Control (FECC) (used for security purposes).
The different video codec are :
- H261 : ITU standard which operates between 40 Kbps and 2Mbps and supports CIF 352 x 288 or Quarter CIF – QCIF 176 x 144
- H263 : It is a low bitrate codec used for SIP and H323 networks (MPEG-1 and MPEG-2)
- H264 : is a great improvement over H263, it is also known as MPEG-4 and Advanced Video Coding (AVC). It permits also the compression of the video in a distinctive way.
- Cisco proprietary wideband