.auto-style1 { font-family: Arial, Helvetica, sans-serif; } .auto-style2 { font-size: 9pt; } .auto-style3 { font-family: Arial, Helvetica, sans-serif; font-size: 9pt; } This is the additional EnGenius DuraFon-SIP Cordless Phone base station. It can use use for expansion of the DuraFon SIP system. SIP Expansion base units can be used to extend the coverage range or add additional lines to your DuraFon SIP system. Key Features: Cordless range Up to 12 floors in a building, 250,000 sq. ft. of facility coverage, 3,000 acres of open land coverage SIP Base supports up to 4 concurrent calls (4 SIP or 3 SIP + 1 PSTN) Works with any IP-PBX that supports the standard SIP protocol Independent 2-way intercom "Push-to-Talk" (PTT) broadcast feature Optional DuraFon-SIP Accessories: EnGenius DuraFon External Antenna