/mcpAES 256 GCM Support for TLS 1.2 Cisco Unified Communications Manager now supports the following TLS 1.2 crypto cipher suites: • TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 • TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 Cisco Unified Communications Manager uses either of the above ciphers to negotiate when a SIP line endpoint handshakes a secure TLS 1.2 connection. If the peer doesn't support TLS1.2 or the GCM ciphers, the connection can fall back to TLS 1.0 with TLS_RSA_WITH_AES_128_CBC_SHA. In addition, a new enterprise parameter, TLS Ciphers, has been added in order to configure whether the AES 256 cipher is preferred or the AES 128 cipher (TLS_RSA_WITH_AES_128_CBC_SHA). By default, the enterprise parameter is set so that Cisco Unified Communications Manager uses the AES 256 cipher if the cipher is supported by the peers. However, you can also set the enterprise parameter so that Cisco Unified Communications Manager uses the AES 128 cipher only. ECDSA TLS Cipher Support Cisco Unified Communications Manager supports the following ciphers for SIP connections that use TLS: • TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 • TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 You can configure Cisco Unified Communications Manager to use these ciphers via the TLS Ciphers enterprise parameter. The default configuration for this enterprise parameter supports the two new ciphers as well as the following existing ciphers: • TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 • TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 • TLS_RSA_WITH_AES_CBC_SHA Opus Codec Support Cisco Unified Communications Manager supports the Opus interactive speech and audio codec. Opus can scale from low bitrate narrowband speech at 6 kbt/second, up to high quality stereo music at 510 kbit/s. Opus is designed to handle a wide range of applications including VoIP, in-game chat, and even live music. The codec is royalty free. The algorithms and source code are openly documented and available. Opus supports several clock rates. The SDP advertises only the highest clock rate, 48000Hz. The actual clock rate of the corresponding media is signaled inside the payload. SDP Example 1 m=audio 54312 RTP/AVP 100 a=rtpmap:100 opus/48000/2 SIP Line Messaging Guide (Standard Edition) for Cisco Unified Communications Manager 48 SIP Standard Line Interface ECDSA TLS Cipher Support