The data restriction setting on phoens prevents barge-in of calls by such things as bridged line appearances.
Essentially, it was created during the days when your phone had a data module and a data call connected your workstation terminal to a mainframe computer by dial-up. The data restriction prevented interruption of the data call in progress.
It was never a very popular feature for data connectivity, but also works to prevent accidental 3 way conferences when there are bridged appearances on voice phones.
The setting on a trunk group would imply that this trunk group is connected to a data device, and that data calls are expected to travel on it. These calls would be protected from interruption in a similar way. If you set that to "y" on a trunk group that carries only voice calls, the PBX would protect all calls from any intrusion tones, call waiting tones, or anything else that may barge into a call.
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