1. Field of the Invention
The present invention relates generally to a test telecommunication terminal used by operators to verify the state of an analog or digital telephone line or a leased telephone line.
2. Description of the Prior Art
At present, when a test terminal of this kind is connected to a telephone line, the terminal operator sets up a call even if another call is already in progress on the line. This disturbs the call in progress and is a major nuisance to users communicating via the telephone line.
In particular, if the call in progress involves analog or digital data terminals, setting up a call from the test terminal seriously disturbs the data exchanged between the data terminals.