McDewey

Do not attempt to invoke any midcall features such as call transfer or hold/resume operations. Doing so can lead to problems and the second video channel can get disconnected. Caution Video Support Unified Communications Manager supports video over H.323, SCCP and SIP protocols. Skinny Client Control Protocol Video Skinny Client Control Protocol video exhibits the following characteristics: • If a phone that is running Skinny Client Control Protocol reports video capabilities, Cisco Unified Communications Manager automatically opens a video channel if the other end supports video. • For Skinny Client Control Protocol video calls, system administration determines video call bandwidth by using regions. The system does not ask users for bit rate. SIP Video SIP video supports the following video calls by using the SIP Signaling Interface (SSI): • SIP to SIP • SIP to H.323 • SIP to SCCP • SIP intercluster trunk • H.323 trunk • Combination of SIP and H.323 trunk SIP video calls also provide media control functions for video conferencing. Unified Communications Manager video supports SIP on both SIP trunks and lines support video signaling. SIP supports the H.261, H.263, H.263+, H.264 (AVC), H.264 (SVC), X-H.264UC (Lync), and AV1 video codecs (it does not support the wideband video codec that the VTA uses). Only some of the endpoints supports AV1 codec. For more information, see Compatability Matrix. Note Configuring SIP Devices for Video Calls Perform the following steps to enable video calls on SIP devices: Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 870 SIP Interoperability Video Support