You can enable call waiting for a specific line or all lines. If enabled, you can receive the call notification (a single
beep and the line button flashes red) while on an active call.
If your administrator has enabled synchronization of Call Waiting between a line and a BroadSoft XSI service, then your setting
only applies to the specific line instead of all lines. Typically, the setting applies to all lines, except for the ones where
the synchronization is enabled.