The value of the object aluVoicePortSignalingType specifies how the signaling leads operate to establish a call. This object is valid for fxo and fxs ports only. privateLineAutomaticRingdown3600 - Does not involve exchange. When subscriber 1 goes off-hook, cadenced ringing occurs at subscriber 2. Subscriber 2 answers call by going off-hook. privateLineAutomaticRingdown1511 - same description as for 3600PLAR but ABCD bits differ loopStart3600 - Subscriber applies loop current to seize the line. Central office signals idle throughout the entire call and does not provide answer supervision. profileOne1511 - same as 3600LS but ABCD bits differ remoteExtension3600 - Subscriber seizes the line by closing loop. Exchange signals idle throughout the entire call and does not provide answer supervision. Subscriber can apply a recall signal by connecting the B lead to earth. fifteenElevenSigSel137 - aka Exchange_transp Valid values for fxo ports: loopStart3600 (muLaw only; default) profileOne1511 ( aLaw only) remoteExtension3600 ( aLaw only; default) fifteenElevenSigSel137 ( aLaw only) Valid values for fxs ports: privateLineAutomaticRingdown3600 privateLineAutomaticRingdown1511 ( aLaw only) loopStart3600 (muLaw only; default) profileOne1511 ( aLaw only) remoteExtension3600 ( aLaw only; default) fifteenElevenSigSel137 ( aLaw only) To change aluVoicePortSignalingType, the port must be shutdown.