Hi, thank you for your question.
Having looked into this for you, I can confirm that the compatibility of the Swissvoice ePure Designer Cordless Telephone - Single depends on the other cordless phones being used. I can advise that this phone is GAP compliant, that means if the phone you are currently using is GAP compliant as well it should be compatible but may have reduced functionality.
Thank you for using Argos Q&A.
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Dale @ Argos
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