SessionDependency was added when the layered video codec support was added. Check the annex on layered video in H.323. (Or AVC's from Intel on the subject) Mark Reid VideoServer Inc. -----Original Message----- From: Mailing list for parties associated with ITU-T Study Group 16 [SMTP:ITU-SG16@mailbag.jf.intel.com] Sent: Thursday, February 12, 1998 12:13 PM To: ITU-SG16 Subject: SessionDependency in H.245 Hello all! I have a question about a new field in H.245: SessionDependency INTEGER (1..255) OPTIONAL What is it used for? Does it hold a SessionId value? Does anybody have (or remember the # of ) the related TD about it? Thank you, Orit Levin RADVision Inc. E Mail: orit@radvision.com 575 Corporate Dr., Suite 420 Tel: 201-529-4300 ext. 230 Mahwah, NJ 07430 Fax: 201-529-3516