Hi everyone, Just wanted to put in a plug for IETF-based solutions to doing service discovery for OSC -- basically, this would entail using SIP: http://www.ietf.org/rfc/rfc3261.txt for session management, and SDP: http://www.ietf.org/internet-drafts/draft-ietf-mmusic-sdp-new-15.txt to describe the sessions themselves. To specify OSC in SDP, you'd use UDP or TCP as a transport specifier on the media line, and make up (and eventually, register) a "fmt" parameter for OSC. One of the things I'm planning to do now that RTP MIDI is finally nearing Last Call is to look at session management frameworks for RTP MIDI that would use SIP + SDP. If OSC went this route too, applications could use the Offer/Answer protocol: http://www.ietf.org/rfc/rfc3264.txt to negotiate to use MIDI (for baseline support) or OSC (to do more sophisticated things). This was one of the motivations behind RTP MIDI -- to offer a migration path from MIDI, without requiring backward-compatibility between control languages ... --- John Lazzaro http://www.cs.berkeley.edu/~lazzaro lazzaro [at] cs [dot] berkeley [dot] edu ---