McDewey

• The call also needs to fulfill the current CAC bandwidth for video calls to have an RTCP pass-through capable MTP. If a call initially establishes with a non-RTCP pass-through capable MTP (before version 15.2(2)T) present in the call, and the call escalates into a video-capable call, Unified CM does not reallocate to an RTCP pass-through capable MTP. In that case, even though the call has been escalated to a video call, the existing MTP does not allow RTCP packets to be passed through. Note Video Codecs Common video codecs include H.261, an older video codec, H.263, a newer codec that gets used to provide internet protocol (IP) video, and H.264, a high-quality codec. The system supports H.264 for calls that use the Skinny Client Control Protocol (SCCP), H.323, and SIP on originating and terminating endpoints only. The system also supports regions and locations. Unified Communications Manager maintains the offerer's video codec ordering preference when making the answer, if possible. H.265 is the preferred video codec is available on the endpoints, otherwise, Unified Communications Manager follows the following codec preference preference order: Description Codecs Preference Order Provides higher quality video using lower bandwidth. H.265 (HEVC) 1 Allows rendering of variable quality video from the same media stream, by disregarding a subset of the packets received. Note H. 264 SVC is a new annex to the H.264-AVC video compression standard; meaning it is an enhancement on top of H.264-AVC. It provides the ability to encapsulate multiple video streams at various frame-rates and resolutions in one container. H.264 (SVC) 2 Microsoft-Proprietary Variant X-H.264UC (Lync) 3 Advanced Video Coding H.264 (AVC) 4 Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 861 SIP Interoperability Video Codecs