The Yealink W79 is a professional ruggedized DECT phone system that supports up to 10 SIP acocunt and 20 simultaneous calls. It has built-in Bluetooth. It can combine up to 10 W59R DECT handsets.
 
Key Features:
High-performance SIP cordless phone system
1.8" 128 x 160 TFT color screen with intuitive user interface
Up to 20 simultaneous calls
Up to 10 DECT cordless handsets
Up to 10 SIP accounts
IP67 Ruggedized DECT Handset
Support Opus audio codec
Noise Reduction System
FNR (Flexible Noise Reduction)/Noise Cancellation
Up to 28-hour talk time (in ideal conditions)
Up to 360-hour standby time (in ideal conditions)
Quick charging: 10-min charge time for 2-hour talk time
TLS and SRTP security encryption  Headset connection via bluetooth
Alarm function
Vibration
Charger wall mountable
 
Datasheet