This is a teleconferencing line for CenturyLink. When you connect to a meeting through your web-browser, you can enter a number and have it call you to connect to the meeting. Someone must have typed your number in by mistake and it called you.

"Hello welcome to the meeting, please press one to join."
I pressed one...
"Everyone will here music until the host joins the meeting"
I let it go for about 3 minutes, no one answered - just music.

I thought this was strange!!