@chuu_x wrote:
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In any case, I will buy a phone. Are there any compatibility requirements for the phone?
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Any ordinary modern phone should be suitable. A cordless setup works best when you are connecting to the back of the hub. Plug the cordless base station into the back of the hub via the adapter mentioned by @newapollo. Use additional satellite cordless handsets as required.
On some rare occasions, there are mentions on the forum of issues connecting the phone. These are usually related to caller ID or the phone not ringing and usually only apply to older equipment (15+ years old) or to a problem on an individual user’s connection. Buy from somewhere which has a good returns policy in case, on the unlikely off-chance, you do run into a problem.