Below you find a way how to pass a special connection string to request a multicast stream via RTSP from a BOSCH IP camera or IP encoder: rtsp://192.168.0.1/&multicast_video=1 The above string triggers the connection to be multicast stream using the multicast IP and port that were predefined in the configuration before. (see device webpage --> Settings --> Network --> Multicasting)
If you want to get the multicast stream on a specific IP and port (e.g. IP 188.8.131.52, port 1234) you can use following syntax: rtsp://192.168.0.1/&multicast_video=1&mc_group_video=184.108.40.206&mc_port_video=1234
You can also use the RTSP SETUP command to enable multicast streaming. Note: Forwarding the RTSP port using RTSP SETUP command is supported with firmware 5.50 and later.
PDF: Please see also the attached PDF from year 2016 which is still of help these days