"DECT IP Multi-Cell DECT Manager DECT technology Air sync and LAN sync Up to 60 base stations Up to 250 handsets Up to 250 SIP accounts Up to 250 parallel calls Support LDAP/Remote Phonebook/XML Phonebook/XSI Directory Compatible with Yealink W56H/W53H/W59R/CP930W/T41S+DD10K without PSU"