1.20 Design Guidelines for Video Greetings

The figure shows the hardware and resource guidelines for planning and sizing Cisco Unity Connection video greetings.

Follow these guidelines when planning to implement video greetings:

  • The video greeting feature is currently supported only using the 7-vCPU OVA template for Cisco Unity Connection. Each server in a Unity Connection cluster can support up to 20 concurrent video calls for a total of 40 video calls within the cluster.
  • Cisco MediaSense must be colocated with Cisco Unity Connection with 1-Gbps connectivity between the servers:
    1. The MediaSense instance must be a single server using the larger 7-vCPU OVA template.
    2. MediaSense must be dedicated for the Cisco Unity Connection video greeting feature.
    3. Less than 10-ms RTT latency is required between the servers when video greetings are used.

The Cisco Unity Connection video greeting feature is currently supported only using the 7-vCPU OVA template. Each server in a Cisco Unity Connection cluster can support up to 20 concurrent video calls for a total of 40 video calls within the cluster. For a single Unity Connection server, 35 concurrent video calls are supported.

Cisco MediaSense must also be deployed using the larger 7-vCPU OVA template. Smaller OVAs will be tested and the design guide will be updated as the testing is completed. This Cisco MediaSense instance must be a single server and cannot be part of a Cisco MediaSense cluster. Also, Cisco MediaSense must be dedicated to the Unity Connection video greeting feature. Only one Cisco Unity Connection high-availability pair or single server can be integrated per Cisco MediaSense server.

Cisco MediaSense must be colocated with Cisco Unity Connection with 1-Gbps connectivity between the servers and less than 10-ms RTT latency.

Video Greetings Operation

Follow these guidelines when planning to implement video greetings:

  • Cisco Unity Connection supports the use of 360p (640 x 360), 480p (720 x 480), 720p (1280 x 720) and 1080p (1920 x 1080) video greetings.
  • Cisco MediaSense and Cisco Unity Connection allow the recording of video greetings up to 1080p (1920 x 1080).
  • Cisco MediaSense does not support transcoding video to reduce the resolution for non-1080p video devices.
  • To restrict video greetings to 360p, Cisco Unity Connection uses Cisco Unified Communications Manager region configurations on the SIP trunk:
    1. Maximum audio bit rate: 64 kbps
    2. Maximum session bit rate for video calls: 600 kbps
    3. Maximum session bit rate for immersive video calls: 600 kbps

p = progressive scan

Video greetings are supported only using SIP trunk integrations. Cisco Unity Connection 10.5.(2) supports the use of 360p (640 x 360), 480p (720 x 480), 720p (1280 x 720), and 1080p (1920 x 1080) video greetings. Cisco MediaSense and Cisco Unity Connection allow the recording of video greetings up to 1080p (1920 x 1080). This situation offers limited compatibility across the video-enabled phone portfolio and is not a supported configuration because Cisco MediaSense does not support transcoding video to reduce the resolution for non-1080p video devices. To restrict video greetings to 360p, Cisco Unity Connection leverages Cisco Unified Communications Manager Region configurations. When video greetings are used in Cisco Unity Connection 10.x, only G.711 mu-law codec is supported for audio and H.264 codec is supported for video. The Cisco Unity Connection SIP trunks must be put in a region that has the following relationship settings, with all other regions containing video-enabled devices that might call Cisco Unity Connection and expect video greetings:

  • Audio Codec Preference List: (default or preference of the administrator)
  • Maximum Audio Bit Rate: 64 kbps
  • Maximum Session Bit Rate for Video Calls: 600 kbps
  • Maximum Session Bit Rate for Immersive Video Calls: 600 kbps

These settings will ensure maximum compatibility across the Cisco video-enabled phone portfolio and provide the best possible experience for using video greetings.

When a video greeting is recorded, the audio and video RTP streams are both sent directly to Cisco Unity Connection. Cisco Unity Connection saves the audio RTP stream locally as an audio-only version of the video greeting and forks the audio and video RTP streams to Cisco MediaSense for recording. For playback, if the device is video-enabled, Cisco Unity Connection will instruct Cisco MediaSense to stream the video greeting to Cisco Unity Connection to be forked to the device. If Cisco MediaSense is not available or unable to play back the video greetings or if the device calling Cisco Unity Connection is not video-enabled, then Cisco Unity Connection will play the audio-only portion of the video greeting that it recorded. The audio-only greeting is the audio track from the video greeting. Different greetings can be used for audio-only callers and for video-enabled callers.

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