When comes to "external publishing point", we only accept RTMP protocol for the time being.
Meaning the external publishing point url must start with "rtmp//xxxxxx.xxxx.com/live" (example). You can exclude the "stream name" from the external publishing point url. For example, if your working rtmp stream have a url of "rtmp://mystreamingurl.com/live/stream1" , you just have to insert "rtmp://mystreamingurl.com/live/" for external publishing point url.
Once it is "restream" accross the CDN, it can be viewed in RTMP, HDS, HLS, Microsoft Smooth Streaming, RTSP protocols. The connection flow would be: Viewer PC ->Closest Streaming Edge -> External Publishing Point
(1) wowza only supports re-streaming h264+aac to HLS/HDS.
(2) For HLS/HDS restream, only wowza rtmp origin is supported