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The Cortelco 2554 Telephone is designed to be mounted on a standard RJ-11 wall jack. This jack is pictured below. The jack must have mounting posts in order to hold the 2554. Also, note that the jack must be mounted so that the small cutout is at the bottom of the plastic jack.
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Press the phone securely into the jack, and then press it down to latch the phone to the jack. Some wall jacks may not be compatible with the sliding jack version of the 2554. Cortelco recommends the following jacks:...
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