I haven't tried it myself but according to the FAQ:
"Jitsi offers a telephony interface that allows users to dial into a conference or for placing dial-out reminder calls. You can try this for free 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. "
if you go to the jitsi.org site and start a meeting, there is a share box that can be popped up and it shows a dial-in number for your conf. So it must have sip integration.
ThinkingGuy|5 years ago
"Jitsi offers a telephony interface that allows users to dial into a conference or for placing dial-out reminder calls. You can try this for free 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. "
https://jitsi.org/user-faq/
saghul|5 years ago
dangerboysteve|5 years ago