status conference
Issue 4 May 2002
8-353555-233-123
Field descriptions
VID
Video and frame rate types that the endpoint supports.
“vfmt” = Does not display if the endpoint has no video capability. All values
are blank if an active call or audio-only endpoint exists. Otherwise, values
for this field include:
■ FCIF for full CIF
■ QCIF for quarter CIF. CIF support implies QCIF support. For larger
screens, CIF typically displays sharper resolution video, ZCIF is
blocked, but may run at higher frame rates with less clarity. Differences
are less observable on very small displays.
■ cfps and qfps are maximum frame rates (frames/second) that the
endpoint can receive video for CIF and QCIF operating modes. CIF
frame rate values are 30fps, 15fps, 10fps, and 7.4fps. If the endpoint
does not support CIF (that is, the vfmt field is QCIF), the
cfps value
should be blank.
■ da_sfg indicates support for H.261 Still Frame Graphics transfers.
■ H.CTX, H.CTX+ and SG4 are proprietary video format capabilities.
■ SG4_sfg indicates support for SG4 Still Frame Graphics
MISC
The restrict field and the 56/64 command mode with a restrict
value indicate that endpoints operate at 56 kbps per channel. Endpoints on
56 kbps conferences must send one or both 2 indications that they are
operating at 56 kbps before they become a video source in a 56 kbps
conference. If they signal that they are operating at 56 kbps in a 64 kbps or
384 kbps conference, they become an audio-only source, but the MCU
continues to send Selected Communication Mode (SCM) toward them
when possible.
A MISC capability of
derestrict and a 56/64 command of
derestrict together indicate that an endpoint operates at 64 kbps. If
either is
restrict, the conference operates at 56 kbps. Other field
values include:
■ dcomp indicates support for WorldWorx PCS data compliance.
■ mbe indicates support for Multi Byte Extension. MBE exchanges
passwords, terminal names, and other special capabilities, such as,
WorldWorx PCS specific features support.
■ cic (Chair Indicate Capability) indicates chair control capability.
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