Station Features and Operation (PT/SLT)User Manual 754.3.3 Alternate Calling — Ring / VoiceYou can voice-announce your intercom call or have the called extension ring. When you makean intercom call by voice-announcement, the other party hears your voice over the built-inspeaker of PT and can speak in the hands-free mode.Alternating (to Voice-Calling mode)Alternating (to Ring-Calling mode)Conditions• Voice-signaling is not available in the following cases:— if the other extension is an SLT.— if the other extension is busy on another call.— if another call is ringing on the other extension.• One time switchingYou can switch the desired calling mode only once during a call.• If the party you are calling is using a single line telephone (SLT), only Ring-Calling modeis available.Any TelephoneIf the extension you are calling is in Ring-Calling mode, you hear a ringback mode.ConfirmationtoneVoice-Calling mode is established..DialAny TelephoneIf the extension you are calling is in Voice-Calling mode, you hear a confirmation.Ringback toneRing-Calling mode is established.Dial .