I dumped Vonage after 14 years ... For my personal/business use. They did release my phone number to my new carrier however T-mobile -- they suck BTW. Turns out they store their personally identifying data at Experian - who got hacked the week after changing the service to T-mobile. T-mobile works well in Europe where I travel often ... T-mobile is a German company.
HTC+bluetooth speakerphone takes up a lot less space. People used to bitch about the old deskphone/speakerphone -- some bitch about the new set up -- fuck 'em. I tell them I am recording their call like their automated AI phone system says it is recording me -- that chills them out fast LOL
Fight fire with fire ... I hate phones anyway but they are convenient at times.
We (the company) have our own SIP/VOIP servers with interfaces with telcom common carriers. SIP is encrypted so unless you are a government agency you cannot subpoena the keys. There is no possibility of interception without government involvement -- nothing much (
) is safe from that these days for 'external' communications.