Can I connect my Konftel 55/55W to the headset port on an Alcate-Lucent phone 8- & 9-series?
Yes, you can use the Plantronics cable with PN 38378-01 connected to the deskphone adapter of the Konftel 55/55W to the headset port on the Alcatel-Lucent phone. See cable below.
Plantronics PN is 38378-01