I think you could use jmp.chat for that, it's based on the foss xmpp protocol as well, which is a plus in my book. Unfortunately the service is only available in the US and canada at the moment...
Self Hosted - Self-hosting your services.
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I'm curious if anybody has a more "self-hosted" solution, but I use burner numbers through the MySudo app and simply delete the number and buy a new one every few months.
If you look up Michael Bazell, he has a strategy for bulk buying voip numbers by tricking voip providers into believing you're a large established business. You could buy dozens of numbers and just cycle through them. But that method requires a lot of work and social engineering and the providers are becoming privy to those tactics.
Probably more trouble than you're looking for, but I run an Asterisk VOIP server. I keep a couple long term numbers and sometimes cycle through disposable numbers.