Cortelco 3690 사용자 설명서

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Adjust the wall mount clip, located on the face of the housing,
by lifting up the clip and rotating it 180 degrees.

Complete the Desk/Wall mounting by installing the handset and
handset cord.

Lift the handset and listen for dial tone.

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When you hear dial tone, your telephone is ready to use.

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If you do not hear dial tone, refer to the Telephone Service
Problems part of your manual.