Guardian Telecom???s SIP-enabled HDE-1100 VoIP Series Emergency telephones are intended for use in areas where direct assistance or hands-free communication is required. HDE VoIP telephones provide a two-way linkto assistance through full-duplex phone transmission. A call may be initiated from the phone by pushing the button which routes the call to its assigned location. These phones also provide the capability of monitoring the status of each unit from a remote location, informing personnel of a malfunction.