this num call me yesterday by 05:51 am and try to call back did not hear anything

This number called me and when i called back, i started to hear strange inaudible voices.

This number calls my line and hung up just as i picked it. The number is strange, i called back and could not connect

This number calls my line and hung up just as i picked it. The number is strange, i called back only to hear inaudible sounds. No response.