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Using the et-687 with extension phones, Using flash, Using tone services on a pulse line – Radio Shack ET-687 User Manual

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Using the et-687 with extension phones, Using flash, Using tone services on a pulse line | Radio Shack ET-687 User Manual | Page 18 / 28 Using the et-687 with extension phones, Using flash, Using tone services on a pulse line | Radio Shack ET-687 User Manual | Page 18 / 28