Direct connect to RJ9 Adapter with short cord. For use connecting any of your quick disconnect headphones to adapters such as the M22 or even directly to some phones. pecial adapter cable to connect Avaya/Lucent/AT&T 7400-series phones to the Plantronics LKA10. Only purchase this set of 2 cables if you are using the Plantronics LKA10 in conjunction with a 7400-series phone.
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