Sangoma P330 with Plantronics/Poly CS540

I’m trying to get a Plantronics CS540 wireless DECT headset to work with a Sangoma P330. I assumed I would need the HC01 EHS, but I’m struggling to figure out how everything should connect. The headset base station has just one single 8-pin RJ45 and a 3.5mm jack, and if I just use the adapter cable that came with the headset that goes from the 8-pin on the base to the RJ11 headset port on the phone, I get audio just fine. But it doesn’t seem that I can answer or hang up calls from the button on the headset. The HC01 doesn’t appear to be usable with the Plantronics CS540 since there is only a single RJ45 on the CS540 basestation. I’m also assuming the older EHS30 doesn’t work with the P-series phones.
What am I doing wrong? Any help would be greatly appreciated. I have scoured the internet and Sangoma’s Wiki, and I’m just not finding any information about the proper way to connect.



The Yealink WH62 Dect headset works on the P330 without any adaptors, just connect with USB cable.

That EHS is only for the Sangoma headsets. For the Polycom headsets you need these:

Thank you so much for your reply. I meant to update this thread earlier, but I kept researching, and finally found a blurb about the proper EHS cable on the Sangoma Help Center/Wiki:
“CS500 series headsets with APP-51 cable, including CS510, CS520, CS530 and CS540 models”
I already ordered them (the same link you shared from Amazon).
Again, thank you so much for your reply, and I hope this dialog will helpful to someone else with the same question.

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