You can start a voice chat by clicking the
Start a voice chat button in the message window or in the Quick Access bar in the Contact List window.
To use the Quick Access option, follow these steps:
1. Click on the name of the friend which you want to start a voice chat with and display the message buttons.

2. Click the
Start a voice call button to display the voice chat message window.
Note: By default the audio session opens in a separate window. You can click the
Group icon to add the window the the grouped messages.

Your friend has to accept the invitation for the audio session to begin.
3.Once your invitation has been accepted, the audio session can begin.
You can also start a voice chat by clicking the
Start a video chat button in the message window.