IBM G325-2585-02 manual Video Chat Automatically adjusting bit rate, Video Chat CPU Usage

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IBM Lotus Sametime 7.5.1

Release Notes

Sametime

Video Chat: Automatically adjusting bit rate

RTCP is used for finding out the current network conditions; it is the feedback mechanism for the Sametime Video Engine. Based on the current network conditions and packet loss, the send bit rate is adjusted by the video engine. The bit-rate increases if more network bandwidth is available, and the remote client will see better quality video. The bit rate is decreased if packet loss increases, and less bandwidth is available. Bit rate is only adjusted based on the network bandwidth available

Sametime

Video Chat: Automatically adjusting send resolution / frame rate

If the client machine the video engine is running on has a CPU usage rate consistently displayed above 95%, the Sametime Video Engine will automatically adjust the frame rate and the send codec resolution. The opposite is also true: if more CPU is available, the Sametime video engine will try to send out at a higher frame-rate and better resolution, up to the maximum resolution specified in Preferences.

Sametime

Video Chat: CPU Usage

Expect high CPU usage when using Video Chat, since grabbing video frames and encoding them into H263 format is a CPU-intensive operation. In addition, the CPU is encrypting /decrypting these packets, and decoding the video frames.

Sametime

Voice chat and Network Address Translation (NAT)

The Sametime 7.5.x voice chat component provides Voice over IP (VoIP) services. To work correctly, voice chat needs to have the network configured properly. Voice chat works with UDP packets; it needs UDP ports to be opened on the firewall of every 7.5.x client. The clients are using a single port (UDP port 20830) for all audio chats; this port needs to be opened for both incoming and outgoing UDP traffic.

Voice chat operates in two different modes:

zDirect P2P connection: UDP packets flow directly between users

zReflector connection: UDP packets go through an audio proxy, called a "reflector", which is a piece of code installed with the Sametime 7.5.x server

In both modes, the firewall needs to let the UDP (port 20830) traffic flow in both directions. The direct P2P connection is used whenever possible, and is the recommended way of using voice chat.

The reflector mode is only used when a specific type of NAT (symmetric NAT) is detected. In that case, since both clients are unable to guess each other's IP address to establish a P2P connection, the UDP packets are relayed through the reflector.

This mode is used for compatibility; performance will not be as good as direct P2P. Consequently, the user could experience additional delays, and a decrease of quality in the voice chat, depending on the Sametime 7.5.x reflector availability.

For NAT environments, the reflector will be used. The reflector uses 2 TCP/UDP ports:

-20831

-20832

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Contents Release Notes First Edition Revised May 31 About this release Known limitations, problems, and workarounds IBM Lotus Sametime Documentation updates Sametime Connect Client New features in IBM Lotus SametimeNew in this release Sametime Server Sametime MobileSametime Meetings Summary Backward compatibilityLimitations Beta release Sametime Sametime pre-7.5 LimitationsSametime Sametime pre-7.5 Product compatibility Installing Sametime 7.5.1 integration with Microsoft OfficeKnown issues Third Party Limitations Sametime 7.5.1 integration with Microsoft OfficeInitializing Sametime within Microsoft Outlook Features Sametime Toolbar in Microsoft OutlookIBM Lotus Sametime IBM Lotus Sametime IBM Lotus Sametime IBM Lotus Sametime IBM Lotus Sametime IBM Lotus Sametime IBM Lotus Sametime Sametime task menu in Microsoft Office Smart Tags IBM Lotus Sametime Configuration options IBM Lotus Sametime IBM Lotus Sametime Synchronization Sametime Client Limitations using Macintosh OSUnsupported languages in this release 1 Hungarian Spell checker overviewSupported languages in this release Hardware requirements for Sametime Hardware requirementsClient hardware requirements Macintosh Operating system Microsoft WindowsOperating system Linux Client hardware requirements LinuxMobile Client requirements Hardware requirements for Sametime 7.5.1 MobileVideo Chat Supported PC Cameras and WebCams Client hardware requirements for Instant MessagingSoftware requirements Server Operating System IBM Lotus Sametime 7.5.1 Meetings requirementsIBM Lotus Sametime 7.5.1 Server software requirements Meetings Client Browsers supportedSametime Client for Macintosh Additional Java requirements Installation notesSilent Install configuration Installing the Lotus Sametime 7.5.1 Software Development Kit Hard Nofile 65535 Soft Pre-installation steps for Linux Sametime ServerLinux Sametime Server 7.5.1 installation on VMWare Operating System Single Sign-On feature installation Installing Sametime Conversion ServicesRun ssoremove.cmd Installing OS Single Sign-OnTroubleshooting Removing OS Single Sign -OnInstalling additional Spell Checker dictionaries Migrating privacy data after upgrading the server Upgrade notesRegistry entry for Sametime installation directory Conversion Services upgrade requiredLaunching and configuring the Sametime Connect 7.5.1 client Configuration notesConfiguring Sametime to work behind WebSEAL reverse proxy Connecting to a Sametime server using a reverse proxy serverProper Configuration Ldap Distinguished Name DN How name should appear in ACL Sametime Connect and Https connections on port 443 orAdd a new IP address to the Sametime server machine Services IBM Lotus Sametime Workaround Windows DEP process causes launch errorAdjusting the logging level in sametime .properties Allow only one chat client connection per IP address Single client loginCollecting Resolve statistics Configurable preferred log-in listCase-sensitivity for the client Case insensitive ID compareDisabling partial search for users or public groups Conversion Services on Windows Sametime serversMultiple Community considerations How to configureForce users to connect through home cluster Peer-to-peer file transfer P2P Sametime Connect client file transfer overviewServer file transfer RTC RTC or P2P? Virus scanning is enabled on the serverVirus scanning is not enabled on the server Virus ScanningSametime does not provide a virus scanner Which transfer method is my client using ?User Consent framework Sametime Policy for Anonymous userSTPolicy exhaustive search through Domino Directory Voice chat and Network Address Translation NAT Video Chat Automatically adjusting bit rateVideo Chat CPU Usage IBM Lotus Sametime Uninstall on AIX when only Application Server is selected Uninstallation informationLimitations Linux Automatic Reconnect not working Possible Linux sound issues with OSSSametime Connect client accessibility issues How Policy affects client-to-client telephonyClick-to-call only works with primary community Contact issuesConversion Service failure produces no error message Internationalization issuesLinux Date displays incorrectly for Login Meeting issuesTelephony, Mute may not work as expected Password is not case-sensitive using Mozilla with RedHatPreferences/Status Messages In a Meeting settings Premiere Global Services audio adapter not supportedDate/time format in unlisted meeting pages is unlocalized When shared window is obstructed users will see graySome German characters may not work in shared application StarOffice Calc and Impress files cannot be attachedExternal user does not receive status messages Sametime Gateway issuesKnown issues with Sametime Connect and Yahoo ! Messenger Sametime Gateway has limited NAT support Server issuesDomino Web Administration does not support Firefox Sametime capabilities are limited with external usersInternet e-mail addresses not supported in Ldap attribute Known problems and workaroundsSametime setup fails when xACL enabled for Domino Directory Tab order problems in installation programCorrupt .oit directory can cause conversions to fail on Unix Cannot rejoin conference call after hanging up phoneUnable to log in to Sametime from Suse Linux client Microsoft Office Integration Re-enable Smart TagAttribute name Attribute value I5/OS Update Business Card setup after changing to LdapPreventing errors when UserInfo servlet processes updates Call menu item on right-click Person menu loses sub-menuEuro symbol may display incorrectly Setting the company name for Domino LdapDo not use the Euro symbol in an attachment name International characters on slides may not display correctly Linux Square symbol may appearCannot edit Telephony-based meetings Users may see incoherent message when ending a meetingDo not use certain characters in a meeting name Do not use certain characters in a meeting passwordDisk space limits for recorded meetings Do not import a nonexistent recorded meeting fileInvalid blacklisted wildcards on Properties Linux Crash when using the IBM JVM 1.4.2 with FirefoxURLs displayed twice Conversion Service and files with wrong extensionsPre-7.5 Sametime clients are not licensed for use STPolicy Server Application trace file size decreasing Quick find behavior when Sametime server uses Domino LdapPolicy Assign Users incorrectly says to select a directory Policy Assign Users pages does not detect Java VMUpgrading to Sametime 7.5.x breaks Avaya Service Provider IBM Lotus Sametime Enabling Telephony support Installing the Sametime serverI5/OS Updates to Installation Guide Case insensitive awarenessClient log file overview Administering the Sametime serverLtpa token authentication Sametime Connect Client end-user Help Sametime Connect Client end-user Help updates/correctionsSametime Meetings end-user Help Meetings end-user Help updates/correctionsIBM Lotus Sametime Where to find notice and license information Trademarks IBM Lotus Sametime