The original intent of H.263 was to work as a codec for H.324 - video over POTS. Most H.323 and H.320 vendors have adopted H.263 for business quality VC (i.e., 384k+) as well as they have found performance benefits at even these levels. H.263 (and its various annexes) are the preferred methods of encoding in the latest systems at nearly all supported speeds (129k - 2Mbps). H.261 would only be used as a "least common denominator" when new codecs communicate with older codecs that may not support H.263.
H.263 compression differs from H.261 in one way only: It makes the assumption, that consecutive image frames consist of a non-moving background with an egg-shaped moving foreground. It provides a significant better ratio of compressionen vs quality only if this assumption is almost true.
Therefore it often will be suggested for low-bandwidth desktop endpoints, where one person is sitting in front of a non-moving cam. However, this advantage of H.263 is present at higher bandwidths and group systems too, if you carefully focus on single speakers.
H.261 makes no assumptions on the image content and works as good as H.263, if VCRs, computer live streams, changing backgrounds or groups of people are presented.
H.261 was a better protocol when H.263 was first introduced for higher bandwidths. BUT with H.263+ the annexs provide for features that are not available in H.261, so if the terminals are using some of the advanced features of the H.263+ it is better. If the terminal does not use the H.263+ annexs H.261 is better.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...