The Yealink W79P SIP phone system is a wireless business phone system that is well suited for small and medium-sized businesses. It is powerful and can be used with up to ten W56H handsets. Set consists of W56H handset and W70B base station, the DECT radio coverage is up to 50 m indoors and 300 m outdoors, excellent HD audio quality up to 10 VoIP accounts and 20 simultaneous calls (2 calls per handset) can be supported.