We do not recommend Jitsi because the e2ee was experimental at the time, not sure how that is these days. That being said I have used Jitsi sometimes as VOIP solution when people needed a phone number I just give theirs and an dial-in code. Perfect way to have a temporary phone number if you know when they will be calling.
“Yes, Jitsi offers a telephony interface that allows users to dial into a conference or for placing dial-out reminder calls. You can try this on meet.jit.si. Self-installed Jitsi Meet deployments will need to setup and configure Jigasi with a SIP provider to connect to the phone network.”