AT&T ISDN 7507, ISDN 7505, ISDN 7506 manual

6Hang up the handset

●If the self-test fails, or if it passes but your set is not working properly, contact your System Manager

Note: If you do not press the ì Select ü and

ìDrop ü buttons, the set automatically exits self-test 30 seconds after the last button press.

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