Is this restriction on the use of replacementFor generally honored? Is there any mention of the topic in H.323 or H.225.0? Is the Appendix making a normative statement? APPENDIX V / H.245 The replacementFor procedure ... Note also that in H.323 systems, receivers are required to re-use the existing media and media control transport addresses. The switch over point to the new logical channel is marked by the RTP header. - TLyons@sonusnet.com +1 732 625-3003 ext 212 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv@mailbag.intel.com