Flash is usually used to send a short disconnect to an analog line, not a PRI line. It is used for telco offsite transfers and as a recall button...give me dialtone back on the same line. The Receptionist should use either the hook switch or the flashing loop key to get the next call. Loops and Parks are really the best way with a PRI. The only exception would be if it is fractional one, less than ten lines and you can square the system...all lines on their own button on each phone. That is just not going to work with a full PRI, it needs too many buttons, so loops, three, and parks, up to six is the way to go.

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