Capture Real Video stream when firewall blocks some ports

Both RM Recorder and Net transport (NetXfer) can record RealMedia streams without problems, if rtsp is enabled. Unfortunately, in my company network, the only protocol allowed is http (rtsp and mms - disabled), so I tried to use http instead of rtsp. For example, RealOne Player can do that, by the following setting:

Tools->Preferences->Connection->Network Transports->Manually configure connection settings->RTSP settings->Attempt to use HTTP for all content.

But I don't know how to "convince" RM Recorder or NetXfer to use http instead of rtsp.

The stream URL is (for example):

rtsp://212.54.100.33/video/DATA-2006-04-14-22-01.rm

In NetXfer, and also in RM Recorder, I've tried the following URL's:

http://212.54.100.33/video/DATA-2006-04-14-22-01.rm
http://212.54.100.33:8080/video/DATA...04-14-22-01.rm
http://212.54.100.33:80/video/DATA-2006-04-14-22-01.rm

But it did not work. In the corporate network, we don't use proxy. In RM Recorder (URL mode), I've tried even the "mirror" mode (which must record in parallel with RealOne Player), but still don't work. RealOne plays fine the stream (through http, of course), but RM Recorder cannot record it.