EnGenius Durafon-SIP SP-935 HC - cordless extension handset with caller ID/call waiting

SP-935 supports both VoIP and PSTN interface, you can connect the base station to legacy PBX?IP-PBX or preference service provider. SP-935 implements EnGenius proprietary air protocol, with high RF transmission and sensitivity, provide superior range and coverage for industrial market. Indoor coverage up to 250,000 sq.ft., outdoor line of sight range up to 5km.