Cetis, a privately held Colorado company serves the hospitality industry worldwide found in most major hotel chains including Marriott, Hilton, Sheraton, etc. In 1979 they acquired Teledex and soon after introduced the Teledex Diamond Hotel Phone Series, the first with a faceplate and programmable guest service key. Today they offer three brands of telephones which can integrate with most proprietary PBX systems, Teledex, TeleMatrix and Scitec. For Teledex phone guides see: Teledex Phone Manuals Below find some TeleMatrix and other Citis phone guides.
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Cetis, headquartered in Colorado is a private company that manufactures hospitality equipment and offers some of the most popular hotel guestroom phones.