This post refers to one extension to work on different terminals on Cloud EC 6.1. Please see the solution below.
【Problem description】
The issue is that the customer needs to use one extension to work on different terminals.
【Problem analysis】
This is not an issue. One extension can only work on one terminal at a time.
【Root cause】
This is not an issue. One extension can only work on one terminal at a time.
【Solution description】
Explained to customer that one extension can only work on one terminal at a time.

