T4 to re-enable the microphone. Alternatively, you can also use T4 before the new connection is made.
In this case the microphone will already be enabled. Given that it is not possible to know beforehand the exact
moment at which the switchboard operator will connect the internal unit to the other party, this strategy has been
chosen in order to ensure that the other party hears nothing unless at the explicit request of the party waiting.
Internal unit connected to another internal unit
Internal unit connected to a porter switchboard
The conversation will proceed as if held directly between the internal unit and the other party.
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