thanks Digiteld. I'm planning to use an IP phone for each site as my control set so it doesn't show Services On on the physical sets.Then unplug the unit.
I have experimented with the automatic schedule 4, it works but other control DN of other lines displayed the Services On on the display.So I revert back to Manual Schedule 4 (F873)and used IP phone as my control DN for VOIP trunk lines and as control DN for all sets that needs to use Schedule 4.Of course I needeed IP client license for all sites.
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