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Viking ring generatorReshapes troublesome distorted ringing signalsBoosts ringing power of analog ISDN Terminal Adapter PortsUse with Viking's doorboxes to increase the number of phones they can ringBoost ring power on telephone lines or analog PABX/KSU stations that are weak or failTrue Sine wave ring signal outputBoosts ring to 4 RENCaller ID compatibleEasy installationCompatible with distinctive ringing servicesWill not affect normal line operationReshapes troublesome square wave ringingNot compatible with pulse dialing