Could this be achevied with SLA (Shared Lina Appearence). Have Line 1 setup as the indviduals private extention with its own ring tone, Have Line 2 setup as a shared line where all external calls are directed and have that with a different ring tone? Line 3 and 4 could also have the shared line setup to allow multiple calls on the shared line. or have more than one shared line and use a dial plan to route calls if the others are busy.
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