KX-NT551RU-B - Panasonic Telephone Service Manual (repair manual). Page 17

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• When connecting a headset, the following headsets can be used with this unit.

(Not all operations with the headsets can be guaranteed.)
- Wired headsets
  Panasonic RP-TCA400, RP-TCA430, KX-TCA400 or KX-TCA430
For up-to-date information about headsets that have been tested with this unit, please contact your dealer.

• Use flexible cables without jack covers. Do not use cables with a hard coating that may tear or crack when bent.

To prevent damage to the cables, use cables that do not protrude from the bottom of the base.
Connect the cables as shown in the following illustration.

• Use a straight CAT 5e (or higher) Ethernet cable (not included) that is 6.5 mm in diameter or less.