RTSP::url replace iRule

If it's TCP, you should be able to add a blank stream profile to the VIP and then use the STREAM::expression and STREAM::enable commands in an iRule to replace the find string with the replace string:

when CLIENT_ACCEPTED {
   STREAM::expression {find replace}
   STREAM::enable
}

This is a bit easier than collecting the TCP data and performing the replacement in the CLIENT_DATA event.

Aaron