CounterPath Bria 3.5.1 for Windows User Guide - Retail Deployments - Manual (Page 83)

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B Application Hot Keys
Function Keyboard Shortcut
Decline an incoming call Ctrl - D
Redial the last dialed number Ctrl - R
or Ctrl - R then Enter
End the call
End the conference call (hang up on all
participants)
Ctrl - E
Hold or resume the call when the focus is on
this call panel Ctrl - H
Mute when the focus is on this call panel Ctrl - M