I believe every new capability set should be treated as a complete replacement for the previously received one. Otherwise conferencing servers (MCS) and Gateways will not be able exercise enough control over the media modes of the multipoint conferences and gateway sessions. Ilya Freytsis -----Original Message----- From: frank.derks@PHILIPS.COM [mailto:frank.derks@PHILIPS.COM] Sent: Monday, November 01, 1999 8:31 AM To: ITU-SG16@mailbag.cps.intel.com Subject: The meaning of the reception of a "new" capability set Neither H.323 nor H.245 are too clear about what it means when an endpoint receives another set of capabilities after having already received one. In previous E-mail messages on this list, I have read that capability sets are cumulative, i.e. anything "new" received in a TCS message adds to the capabilities transmitted in a previous TCS message. I have, however, found nothing in the recommendations that backs this up. So what is the intended procedure? Does a newly received set of capabilities replace the previously received set? Do capabilities received in a TCS message add to the already received capabilities? How are capabilities removed? What constitutes an "empty capability set" etc. I would appreciate it if somebody could point me in the right direction. Regards, Frank