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CUCM CUVA configuration includes the following steps:
Step 1 Configure regions with the maximum audio codec and video call speed
to be used per video call.
Step 2 Configure the maximum allowed bandwidth used by video calls within
or between locations.
Step 3 Configure the IP phone in CUCM to support CUVA.
Step 4 Verify CUVA support on the IP phone.
The CUCM region configuration specifies the audio codec type to use between regions,
and the video setting specifies the bandwidth to use between regions. The audio codec and
video call bandwidth fields perform similar functions. The audio codec value defines the
maximum bit rate allowed for the audio channel in both audio only and video calls, and the
video call bandwidth value defines the maximum bit rate for both the audio and video
channel in a video call.
Table 19-2 Video Bit Rates
Video Call Speed Audio Code / Rate Video Codec / Rate
128 kbps G.711 (64 kbps) H.263/H.264 (64 kbps)
128 kbps G.729 (8 kbps) H.263/H.264 (120 kbps)
128 kbps G.728 (16 kbps) H.263/H.264 (112 kbps)
384 kbps G.711 (64 kbps) H.263/H.264 (376 kbps)
384 kbps G.729 (8 kbps) H.263/H.264 (320 kbps)
768 kbps G.729 (8 kbps) H.263/H.264 (760 kbps)
768 kbps G.711 (64 kbps) H.263/H.264 (704 kbps)
1.472 Mbps G.729 (8 kbps) H.263/H.264 (1.464 Mbps)
1.472 Mbps G.711 (64 kbps) H.263/H.264 (1.408 Mbps)
7 Mbps G.729 (8 kbps) H.263/H.264 (6.992 Mbps)
7 Mbps G.711 (64 kbps) H.263/H.264 (6.936 Mbps)
CUCM Configuration 495
A video bandwidth value of none would pass audio-only calls, if the calling device has the
Retry Video Call as Audio option enabled. The region settings are configured under System
> Region. Each region must be configured to set the relationship to the other regions. The
region configuration is illustrated in Figure 19-3.
Figure 19-3 Region Configuration
The locations configuration in CUCM applies call admission control (CAC) to limit the
number of audio and video calls that can be placed between locations. Locations typically
represent geographical sites that are separated over an IP WAN.
Both the Audio Bandwidth and the Video Bandwidth fields offer the options of Unlimited
and a numeric bandwidth value. Video bandwidth can be set to None to disallow video calls
over the IP WAN (between locations). If numeric values are configured, they use two
different calculation models:
■ Audio Bandwidth field: The value entered has to include the Layer 3 (IP) and Layer
4 (UDP/RTP) overhead required for the call. G.729 calls require 24 kbps because the
audio codec operates at 8kbps, and the overhead operates at 16kbps. G.711 calls
require 80 kbps because the audio codec operates at 64 kbps, and the overhead operates
at 16kbps.
■ Video Bandwidth field: The value in the Video Bandwidth field is entered without
overhead factoring. The video bandwidth is dynamically configured by subtracting the
audio codec bandwidth from the full video bandwidth allowed.
Resource Reservation Protocol (RSVP) is the only topology-aware CAC mechanism. The
H.323 gatekeeper and locations CAC mechanisms are not topology aware. H.323 gatekeepers
and locations work on a hub-and-spoke physical topology premise. Most WANs
today are partial-mesh or full-mesh environments using Multiprotocol Label Switching
496 Chapter 19: Cisco Unified Video Advantage
(MPLS) virtual private networks (VPN). H.323 gatekeepers and locations can still be used
in these environments with branch-to-branch connectivity, but the CAC mechanisms would
not be able to make full use of the topologies’ bandwidth capabilities. RSVP settings
include the following:
■ Use System Default: The RSVP policy to the selected location matches the CUCM
Default Interlocation RSVP Policy service parameter. The default value for this service
parameter is No Reservation.
■ No Reservation: No RSVP reservations are made to the selected location.
■ Optional (Video Desired): A call can proceed as a best-effort audio-only call if no
reservations for both the audio and video streams can be obtained. Cisco RSVP Agent
continues to attempt RSVP reservation and informs CUCM if reservation succeeds.
■ Mandatory: CUCM does not ring the terminating device until RSVP reservation
succeeds for the audio stream and, if the call is a video call, for the video stream as
well.
■ Mandatory (Video Desired): A video call can proceed as an audio-only call if a
reservation for the video stream cannot be obtained.
Most CUCM administrators use the RSVP system default.
To configure locations, navigate to System > Locations via CUCM Administration.
Location configuration is illustrated in Figure 19-4.
Figure 19-4 Location Configuration
NOTE More information about CAC using locations and RSVP-enabled locations is
provided in the Cisco Unified Communications IP Telephony, Part 2.
CUCM Configuration 497
You can find the IP phone configuration settings that are required for video support in the
IP Phone Configuration window of CUCM Administration. The following configurations
are necessary:
■ The PC that has CUVA installed needs to be physically connected to a PC port of the
IP phone. Ensure that the PC port of the IP phone is not disabled under the CUCM IP
phone configuration. The PC port is enabled by default.
■ The Video Capabilities field needs to be set to Enabled to allow the phone to participate
in video calls. The video capabilities are disabled by default.
The Retry Video Call as Audio check box is located in the Phone Configuration window
and is activated by default. If you uncheck this check box, a video call that fails to connect
is not attempted as an audio-only call instead. Figure 19-5 shows the video-related settings
of the IP phone.
Figure 19-5 Phone Video Settings
An IP phone or IP Communicator enabled for video displays a video camera icon in the
lower-right corner of its LCD screen. Figure 19-6 shows this icon in IP Communicator.
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