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Using plantronics CS70n on Polycom IP330...?

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Using plantronics CS70n on Polycom IP330...?



We are looking to use the Polycom IP330 as our reception phones and I have also purchased the Plantronics CS70N to work with the phone system. I have the APP-5 EHS but it seems I need an additional lead, a 2.5mm to RS9 female adaptor but my question is how do I connect this to ensure it works and secondly, where can I buy the 2.5mm to RS9 female adaptor from in the UK?


I have bought one adaptor lead that was supposed to work but it has a male RS9 and not a female...can any one help..???


Many thanks,



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Polycom Employee & Community Manager

Re: Using plantronics CS70n on Polycom IP330...?

Hello Ben,


welcome to the Polycom Community.


The FAQ suggests to search the Feature Descriptions & Technical Notifications and the following Document => here <= outlines the Phones compatibility and cables needed.


In addition Plantronics own CS70 Website may contain Information or Support Documents regarding this headset.


Best regards


Steffen Baier


Polycom Global Services

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