China Excelltel Central Telephone System CS424 Pabx

CS424CO Capacity(Min/Max: 4) Specific C.O. Line Dialing Extension Capacity(Min/Max: 24) Call All ExtensionsExternal Music on Holding Three Way ConferenceBackup Battery Interface (Optional)Do Not Disturb Operator/Auto-attendant Mode Auto/Manual Dial-Out ModeOperator designationCall Restriction Recordable OGM(outgoing messae)Call Duration Control 10 SecondsC.O. Line&Exts Monitor Internal Music on Holding Ringing Assignment External Music on Holding Flexible coding(change Ext.No.) Ringing Assignment(CO-Ext group)Automatic Ext. Reporting Ring IdentifyFlash Time Choice System CRBTSystem Password External Caller ID Remote Programming Call Transfer Memory Protect while Power off Call Forwarding7 Multiple Communications Channel Outgoing Call Transfer Power Failure Transfer CO to CO Transfer Lightning Protection Call Switch (pickup in conversation)Housing Material :PlasticCall Pickup (External call)Normal Transformer Power C.O. Line Reservation(Call waiting)Switch Power (Optional)C.O. Line Booking Backup Battery Interface (Optional)