Receive Calls via Handsets or Loudspeaker
The indoor station and indoor extension can receive calls from door station, outer door station and sub door station. You can received these calls via handsets.
Note:
Make sure the device is equipped with handsets.
Figure 1 Calling
After receiving the call with handset, you can shift it to loudspeaker by tapping 
on the calling page.
Note:
The indoor extension can connect to indoor station with network cables. After connecting, the indoor extension can receive calls from devices that linked to the indoor station.