The Yealink W90 DECT IP Multi-Cell System, consisting of two elements – a base station W90B and a DECT Manager W90DM, is designed to provide the organizations who require wireless coverage with the full ease of deployment. This DECT multi-cell system intends to create an extremely scalable and reliable solution for the organizations of any size and any shape. The system supports up to 250 handsets and 250 simultaneous calls, which ensures one call in each handset, and allows you to get rid of the limited wireless signal coverage of only one base station. Meanwhile, the system can work with Yealink W53H, W56H, W59R, CP930W, and DD Phone with seamless roaming and handover of the calls, making freely mobile communication in and between each zone achievable. Both W90B and W90DM join the modern, compact design with Yealink HD voice quality, that setting free your ears and giving you an elaborate audio experience.Support Air and LAN synchronizationSeamless handover and roamingUp to 60 base stationsUp to 250 handsetsUp to 250 SIP accountsUp to 250 parallel callsSupport XML/LDAP/Remote PhonebookSupport XSI Directory/XSI Call LogExternal antenna, DECT radio coverage up to 50m indoors and 300m outdoorsDECT technologySupport OpusSupport SRTP / SIPS / TLS, LDAP(s) and HTTPSSupport PoECompatible with Yealink W59R/W56H/W53H, CP930W and DD Phone