Managing media encryption and codecsAdded by IBM on November 23, 2011 | Version 1 (Original)
|You can manage the type of media encryption and codecs used in meetings on the IBM® Sametime Media Manager.
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.
- Log in to the Integrated Solutions Console.
- Click Sametime System Console -> Sametime Servers -> Sametime Media Manager.
- 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 box deployment with all components on one machine: Under Audio Video Media, 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 Media Manager Packet Switcher or the Sametime® Unified Telephony Media Server are not encrypted.
- Non-clustered distributed and clustered deployments:
- Under Audio Video Media change the encryption option to Enable or Disable. This action only automatically updates the stavconfig.xml file of the Conference Manager component.
- A manual update is required on Packet Switcher deployments. Update the stavconfig.xml encryption field values to NoEncryption if you have selected Disable, or to SRTP if Enable is selected, into the Deployment Manager server's scope stavconfig.xml files, and run Full-resynchronize on nodes, then restart the Packet Switcher servers.
NoEncryption and SRTP are the only string literals to update stavconfig.xml with.
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.
Prioritize the video codecs by using the Up and Down buttons to move the video codecs in the list.
Sametime Media Manager supports the following audio codecs:
- ISAC - Internet Speech Audio Codec (iSAC) is a wideband and adaptive bit rate codec. The bit rate ranges from 10 to 32 kbps (Kilobit per second) depending on the available network bandwidth. This is the default codec.
- iLBC - Internet Low Bit-rate Codec (iLBC) is a narrowband low bit rate speech codec. It requires 15.2 kpbs bandwidth.
- G.722.1 - Popular wideband audio codec that operates at one of three selectable bit rates: 32000, 24000, 16000. G7221 is a licensed royalty-free standard audio codec providing high quality, moderate bit rate audio coding.
- G.711 - Old and widely supported narrowband codec. It requires 64 kbps bandwidth but consumes less CPU to process.
Restart the Sametime Media Manager.
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).
- H263 - A legacy codec and lower quality than H264.
Parent topic: Administering a Sametime Media Manager