The terminal block is programmed by the telecom company technicians. The settings that must be programmed on the terminal block are linked to the ISDN line by way of a single number. In this case the call must leave the terminal block with alternative distribution, in other words an incoming call must ring just one telephone at a time. The called user must engage the first free line, while a second call must engage the second free line.
Operation in which both telephones ring simultaneously is not correct.
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