Configuring QoS settings on the Sametime web client for OS X

Configure QoS (quality of service) settings on the IBM® Sametime® web client by editing the preferences.ini file that is installed with the WebPlayer plug-in.

Before you begin

This task applies only to the web client for OS X; the settings described here cannot be modified in Microsoft™ Windows™. For Windows, the Sametime web client uses the Windows Audio/Video QoS type; the corresponding DSCP type is 0x28. For details, see the Windows documentation on the QOS_TRAFFIC_TYPE enumeration.

About this task

In Sametime, you can configure QoS using DIFFSERV values, which are the decimal equivalents of hexadecimal DSCP codes. Use the following table to determine the DIFFSERV values that correspond to the DSCP codes that you want to use.

Table 1. DSCP codes and their corresponding DIFFSERV valuesThe DSCP codes are grouped by CS (Class of Service) level and range from 0 through 56.
DSCP code DIFFSERV value
Default 0
CS1 8
AF11 10
AF12 12
AF13 14
CS2 16
AF21 18
AF22 20
AF23 22
CS3 24
AF31 26
AF32 28
AF33 30
CS4 32
AF41 34
AF42 36
AF43 38
CS5 40
EF 46
CS6 48
CS7 56

Procedure

You can update the preferences.ini and push it to clients as described in Pushing updates to installed clients automatically, or you can update clients directly on user workstations as explained in the following steps.
  1. On the client computer, navigate to the directory where the preferences.ini file is stored; for example: 
    /User/Admin/Library/Application Support/IBM/Sametime WebPlayer/Plugins/stmfwsoftphone
  2. Open the preferences.ini file in a text editor.
  3. In the file, locate the QOSEnable setting.
  4. Set the QOSEnable value to true.
  5. Set the audio value to the DIFFSERV value that you are using for audio transmissions.
  6. Set the video value to the DIFFSERV value that you are using for video transmissions.
  7. Set the servicetype value to DIFFSERV.
  8. Save and close the file.
  9. Restart the browser so that the change can take effect.