When you configure a Yealink Wireless Phone, for example, W70B with multiple handsets, there could be an issue where only one of the handsets ring when receiving a call and all the handsets have the same line assigned.
To solve this you have to assign the line in question to each handset you wish to receive calls to. The following article explains how to perform such a configuration.
Assigning Incoming Lines to the Handset
You can assign one or more incoming lines for the handset. The handset can only receive incoming calls of
the assigned incoming line(s).
Procedure
1. Go to OK > Settings > Telephony > Incoming Lines.
2. Enter the system PIN (default: 0000) and press Done.
The handset screen displays all registered handsets. The handset itself is highlighted and followed by a left arrow.
3. Select the desired handset.
4. Select Accept from the desired line fields.
5. Confirm the action.