This article relates to the Cisco TelePresence MCU 4203, Cisco TelePresence MCU MSE 8420, Cisco TelePresence IP VCR 2210, Cisco TelePresence VCR MSE 8220, Cisco TelePresence MCU 4505 and Cisco TelePresence MCU MSE 8510 products.
Q. Why is video sometimes dropped between a Polycom MGC and a Codian IP VCR or MCU during a call?
A. If you have both H.263 and H.264 enabled on the MCU or IP VCR - and Video transmit size optimization set to Dynamic codec and resolution - when the MCU or IP VCR attempts to change codec this causes the Polycom MGC to drop video and report a connection state of secondary.
To resolve this problem, on the MCU go to Settings > Connections and on the IP VCR go to Settings > Connections, then set Video transmit size optimization to Dynamic resolution only.