Thank you all so much.
Now I knew the version is "P ACS R2.0" from Feature 59, is that means I can't set the ext10 to 6 or 7 rings with VMS cover rings (#117) on at station by station basis?
How can I know the System version without opening the hareware and how to set ext10 to 6 or 7 rings with VMS cover rings (#117) on at station by station basis.
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