I have been asked for this basic question from some members in this forum, so I decided to share the official link below. If this triggered any violation of any policy, please fee free to remove it and warn me.
Re-stream from another source in Wowza Streaming Engin
Use Wowza Streaming Engine .stream files to re-stream from MPEG-TS encoders, IP cameras, SHOUTcast/Icecast streams, RTP encoders, and SRT.
www.wowza.com