Yealink Cordless DECT IP Multi-Cell Base Station, Seamless handover and roaming, Up to 100 parallel calls, Up to 30 base stations, Up to 100 handsets, Up to 100 SIP accounts, Support LDAP/Remote Phonebook, Support Xsi Directory, DECT radio coverage up to 50m indoors and 300m outdoors, DECT technology: Yealink DECT technology is based on CAT-iq2.0, which focuses on high quality Audio VoIP (wideband), as well as low bit-rate data applications. But we are not compatible with any third-party DECT devices (base station, handset, etc.), Support Opus, Support PoE, Compatible with Yealink W56H/W53H (version x.83.0.20 or later).