The default value for this Service Parameter is Enabled for All Devices.Īdded Opus Codec in the Audio codec preference list. Enabled for All Devices Except Recording-Enabled Devices.UCM selects common sets of codecs from both offers and passes them in the respective answer.Īdds a new Service Parameter under CallManager as shown in the image: Offers from A and B contain opus codec amongst others and both can receive multiple codecs in the answer. UCM passes on the both payloads in the respective answer regardless of their support for multiple payloads (codecs) in the answer SDP. UCM shall forward both payloads from A’s offer to B regardless of the fact that B is can receive multiple codecs in the answer.īoth A and B offer two payloads. Unified Communications Manager (UCM) forwards the fmtp line in a transparent manner.Ī side offers two Opus profiles (payloads) but B side offers only one profile. M=audio 54312 RTP/AVP 99 a=rtpmap:99 opus/48000/2 a=fmtp:99 maxplaybackrate=16000 sprop-maxcapturerate=16000 maxaveragebitrate=20000 stereo=1 useinbandfec=1 usedtx=0īoth sides offer a single packet-tracer (PT) but B-side offer does not have fmtp line. These parameters are declarative in nature, which indicates either the receive capability or send capability.ĬUCM passes through fmtp optional parameters from one side to other if opus codec is negotiated in the call.Ĭisco recommends to use payload 114 for Opus codec. Opus defines these optional media format (fmtp) parameters. The actual clock rate of the corresponding media is signaled inside the payload. Session Description Protocol (SDP) Syntax and SemanticsĬlock rate: Opus supports several clock rates only the highest clock rate, 48000 Hz, is advertised in the SDP. A reference implementation, which includes the source code, is publicly available. It is royalty free, and the algorithms are openly documented. Opus uses both Linear Prediction (LP) and the Modified Discrete Cosine Transform (MDCT) to achieve good compression of both speech and music. It scales from low bitrate narrowband speech at 6 kbit/s to very high quality stereo music at 510 kbit/s. It is designed to handle a wide range of interactive audio applications, which includes Voice over IP, videoconferencing, in-game chat, and even live distributed music performances. Opus is an interactive speech and audio codec. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. Please review the feature guide for the corresponding end point. Note: Not all end points support OPUS codec at the moment. Cisco Unified Communications Manager version 11.0.
Cisco mcs codec autoanswer software#
The information in this document is based on these software versions: There are no specific requirements for this document. This document describes the presence of OPUS codec, which was not available earlier, in Cisco Unified Communications Manager (CUCM) version 11.
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