based videoconferencing to integrate with newer IP-based H.323 videoconferencing
devices. Cisco IP/VC gateways support H.261 and H.263 video coders/
decoders (CODECs); H.261 is used as multiple channels of 64 Kbps, while
H.263 is a higher quality video CODEC.Table 3.1 lists the formats and image
sizes supported by H.261 and H.263.
Table 3.1 Video Image Format Standards
Format Image Size H.261 H.263
Sub-QCIF 128x96 Optional Required
QCIF 176x144 Required Required
CIF 352x288 Optional Optional
4CIF 702x576 N/A Optional
16CIF 1408x1152 N/A Optional