----- Original Message ----- From: "Brian E Carpenter" <[EMAIL PROTECTED]> To: "Scott Bradner" <[EMAIL PROTECTED]> > > > > Scott > > > > (ps - for a data point in the mutability camp, Cisco IP phones are designed > > with two Ethernet jacks, one to connect to the wall jack - the desktop > > machine is to be plugged into the other. The phone clears the DSCP on > > all packets it forwards from the desktop and sets the DSCP to 5 on all > > of its own data packets - I assume to protect the infrastructure from > > applications on the desktop that might overwhelm the net with packets > > marked as high priority) > > Right, and this is a hangover from the days before the EF code point was > assigned, and we were advising experimenters to use Precedence 5 for EF > tests. > > Brian > --------------------------------------------------------------------
If the phone has RIFRAF Routing, then you can ping it and have it go into IPv4++ mode. Also, 5 is for Audio - Telephone Quality 0x55 for Phone to Phone The special 0x0* or 0x*0 codes are for Conference Room exchanges 0000 5 - 0101 Audio - Telephone Quality Individual Microphone 0000 6 - 0110 Audio - CD Quality Stereo Room Speakerphone 5 - 0101 0000 Audio - Telephone Quality Center Speaker 6 - 0110 0000 Audio - CD Quality Stereo Surround Speakers ---- See also Dr. Dobb's Journal - Cover Story on vPC February 1984 - Issue #88 - Page 32. Jim Fleming http://www.IPv8.info IPv16....One Better !! -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
