Hung up straight after I answered. Spammers and Scammers often do this to first, to check if the number is active (you answered it), then you'll be barraged with spam and scam calls soon after. Best to let it go to voicemail. Voicemails from spammers and scammers won't say who they are, why they're calling and won't know your name.

Message said "you are the only person in the conference" and then the call ended.

Caller: Solar Reabe Panels

Scam company selling solar rebates