You can manage the type of media encryption and codecs
used in meetings on the IBM® Sametime® Media Manager.
About this task
A codec compresses streaming data, such as audio or video,
on the transmitting side and decompresses it for playback on the receiving
side. Codecs reduce the amount of bandwidth required to send streaming
data. Generally, higher compression conserves more bandwidth. Higher
compression also results in poorer audio or video quality and requires
more resources to compress and decompress the data streams.
You
can change the type audio and video codecs.
Procedure
- Log in to the Integrated Solutions Console.
- Click .
- In the Sametime Media Managers list,
click the deployment name of the Sametime Media Manager.
- Click the Configuration tab.
- Follow the procedure appropriate for your deployment:
- Single computer deployment with all components on one computer:
In the "Audio Video Media" section, keep the default encryption option
as Disable or click Enable.
Calls made between the Sametime Connect
client and any other endpoint supporting SRTP including another Sametime Connect client
or a partner conference bridge are encrypted. Audio/video conferences
with three or more participants using the Sametime Media Manager or
the Sametime Unified
Telephony Media
Server are not encrypted.
- Non-clustered distributed and clustered deployments: In the "Audio
Video Media" section, change the encryption option to Enable or Disable.
This action only automatically updates the stavconfig.xml file
of the Conference Manager component.
The
Sametime Community
Server default refresh interval is one hour. The
Sametime Connect client
gets the updated server policy attribute after one hour.
- Prioritize the audio codecs by using the Up and Down buttons
to move the audio codecs in the list.
Sametime Media Manager supports
the following audio codecs:
Note: Sametime 9.0 client and
more recent does not support ISAC and iLBC.
- Prioritize the video codecs by using the Up and Down buttons
to move the video codecs in the list.
Sametime Media Manager supports
two video codecs:
- H264 - Also known as AVC and MPEG-4 part 10. It provides high
quality, block-oriented, motion-compensation-based video codec for
video conferencing. It supports the Baseline Profile without Flexible
Macroblock Ordering (FMO).
- H264 Scalable Video Codec - Also known as SVC, this software is
Annex G extension of the H.264 codec standard, which is used by most
of today's video conferencing devices. It enables forward compatibility
for older hardware, because the same bitstream can be used by basic
hardware to decode low-resolution (720p or 1080i), and newer advanced
hardware can decode high quality video stream (1080p).
- H263 - A legacy codec of a lower quality than H264.
- Click OK.
- Restart the Sametime Media
Manager.