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The call admission control function is an important component of any IP telephony system, especially those that involve multiple sites connected through an IP WAN. In order to better understand what call admission control does and why it is needed, consider the example in Figure As shown on the left side of Figuretraditional TDM-based PBXs operate within circuit-switched networks, where a circuit is established each time a call is set up.

If no trunks are available, the call is rejected by the PBX and the caller hears a network-busy signal. Now consider the IP telephony system shown on the right side of Figure Because it is based on a packet-switched network the IP networkno circuits are established to set up an IP telephony call. Instead, the IP packets containing the voice samples are simply routed across the IP network together with other types of data packets.

Quality of Service QoS is used to differentiate the voice packets from the data packets, but bandwidth resources, especially on IP WAN links, are not infinite. Therefore, network administrators dedicate a certain amount of "priority" bandwidth to voice traffic on each IP WAN link. However, once the provisioned bandwidth has been fully utilized, the IP telephony system must reject subsequent calls to avoid oversubscription of the priority queue on the IP WAN link, which would cause binary option system 9 bandwidth degradation for all voice calls.

This function is known as call admission control, and it is essential to guarantee good voice quality in a multisite deployment involving an IP WAN. To preserve a satisfactory end-user experience, the call admission control function should always be performed during the call setup phase so that, if there are no network resources available, a message can be presented to the end-user or the call can be rerouted across a different network such as the PSTN.

Table lists the topics that are new in this chapter or that have changed significantly from previous releases of this document. Video Bandwidth Utilization and Admission Control. Design Considerations for Call Admission Control.

There are several mechanisms that perform the call admission control function in a Cisco Collaboration system. For all other call admission control mechanisms, refer to the following information:. Gatekeeper is a legacy technology used for dial-plan resolution and admission control in H. With most networks today supporting SIP or mixed H. For networks supporting H. RSVP-enabled networks are possible although not recommended in Unified Communications and Collaboration deployments where TelePresence is pervasively deployed.

This means that deployments where RSVP call admission control for desktop video as well as telepresence-to-desktop video interoperation are desired, require a more complex design to ensure that telepresence-to-telepresence calls are provisioned without RSVP while all other calls are provisioned for RSVP. Cisco Unified CM 9. The Enhanced Location CAC feature also supports immersive video, allowing the administrator to control call admissions for immersive video calls such as TelePresence separately from other video calls.

This network modeling functionality has also been incrementally enhanced to support multi-cluster distributed Unified CM deployments. This allows the administrator to effectively "share" locations between clusters by enabling the clusters to communicate with one another to reserve, release, and adjust allocated bandwidth for the same locations across clusters.

In addition, an administrator has the ability to provision bandwidth separately for immersive video calls such as TelePresence by allocating a new field to the Binary option system 9 bandwidth configuration called immersive video bandwidth.

The CAC enhancements and design are discussed in detail in this chapter, but the troubleshooting and serviceability tools are discussed in separate product documentation. Although Unified CM provides configuration and serviceability interfaces binary option system 9 bandwidth order to binary option system 9 bandwidth the network, it is still a "static" CAC mechanism that does not take into account network failures and network protocol rerouting as an RSVP-based CAC solution does.

Therefore, the model needs to be updated when the WAN network topology changes. Enhanced Location CAC is also call oriented, and bandwidth deductions are per-call not per-stream, so asymmetric media flows where the bit-rate is higher in one direction than in the other will always deduct for the highest bit rate.

In addition, unidirectional media flows will be deducted as if they were bidirectional media flows. Enhanced Location CAC incorporates the following configuration components to allow the administrator to build the network model using locations and links:.

Unified CM uses the concept of locations to represent a physical site and to create an association with media devices such as endpoints, voice messaging ports, trunks, gateways, and so forth, through direct configuration on the device itself, through a device pool, or even through device mobility. Links interconnect locations and are used to define bandwidth available between locations. Links logically represent the WAN links.

This section describes locations and links and how they are used. The location configuration itself consists of three main parts: In the configuration, the link bandwidth parameters are displayed first while the intra-location bandwidth parameters are hidden and displayed by selecting the Show advanced link.

The intra-location bandwidth parameters allow the administrator to configure bandwidth allocations for three call types: They limit the amount of traffic within, as well as to or from, any given location. When any device makes or receives a call, bandwidth is deducted from the applicable bandwidth allocation for that call type. This feature allows administrators to effectively limit the amount of bandwidth used on the LAN or transit binary option system 9 bandwidth.

However, there are some deployments that can benefit from limiting high-bandwidth video calls. If user calls are mostly all video-enabled, it is easy to see binary option system 9 bandwidth a large number of 1 to 2 Mbps video calls might utilize a large percentage of available bandwidth on a LAN, and an administrator might consider limiting the number of video calls to a smaller percentage of that available LAN bandwidth.

Keep in mind that this utilization might occur only during the busy hour of business or during a specific time of the year when specific traffic levels spike, and the bandwidth limit would be reached only during that time when it would be needed to ensure that the LAN is not over-subscribed with video traffic. It is also noteworthy to mention that video devices can be enabled to Retry Video Call as Audio if a video call to that device fails for any reason.

This is configured on the video endpoint configuration page in Unified CM and is applicable to video endpoints or trunks receiving calls. It should also be noted that for some video endpoints Retry Video Call as Audio is enabled by default and not configurable on the endpoint. The link bandwidth parameters allow the administrator to characterize the provisioned bandwidth for audio, video, and immersive calls between "adjacent locations" that is, locations that have a link configured between them.

This feature offers the administrator the ability to create a string of location pairings in order to model a multi-hop WAN network. To illustrate this, consider a simple three-hop WAN topology connecting four physical sites, as shown in Figure Note that binary option system 9 bandwidth we create a link from San Jose to Boulder, for example, the inverse link Boulder to San Jose also exists. Therefore, the administrator needs to create the link pairing only once from either location configuration page.

In binary option system 9 bandwidth example in Figureeach of the three links has binary option system 9 bandwidth same settings: When a call is made between San Jose and RTP, Unified CM calculates the bandwidth of the requested call, which is determined by the region pair between the two devices see Locations, Links, and Region Settings and verifies the effective path between the two locations.

That is to say, Unified CM verifies the locations and links that make up the path between the two locations and accordingly deducts bandwidth from each link and if applicable from each location in the path. The intra-location bandwidth also is deducted along the path if any of the locations has configured a bandwidth value other than unlimited.

Weight is configurable on the link only and provides the ability to force a specific path choice when multiple paths between two locations are available. When multiple paths are configured, only one will be selected based on the cumulative weight, and this path is referred to as the effective path. This weight is static and the effective path does not change dynamically.

Figure illustrates weight configured on links between three locations: San Jose, Boulder, and Seattle. Figure Cumulative Path Weights. Thus, the direct link is chosen as the effective path because the cumulative link weight is When you configure a device in Unified CM, the device can be assigned to a location. A location can be configured with links to other locations in order to build a topology. The locations configured in Unified CM are virtual locations and not real, physical locations.

As mentioned, Unified CM has no knowledge of the actual physical topology of the network. Therefore, any changes to the physical network must be made manually in Unified CM to map binary option system 9 bandwidth real underlying network topology with the Unified CM locations model. If a device is moved from one physical location to another, the system administrator must either perform a manual update on its location configuration or else implement the device mobility feature so that Unified CM can correctly calculate bandwidth allocations for calls to and from that device.

Unified CM allows you to define separate voice, video, and immersive video bandwidth pools for each location and link between locations. Typically the locations intra-location bandwidth configuration is left as a default of Unlimited while the link between locations is binary option system 9 bandwidth to binary option system 9 bandwidth finite binary option system 9 bandwidth of kilobits per second kbps to match the capacity of a WAN links between physical sites.

If the location's intra-location audio, video, and immersive bandwidths are configured as Unlimitedthere will be unlimited bandwidth available for all calls audio, video, and immersive within that location and transiting that location.

On the other hand, if the bandwidth values are set to a binary option system 9 bandwidth number of kilobits per second kbpsUnified CM will track all calls within the location and all calls that use the location as a transit location a location that is in the calculation path but is not the binary option system 9 bandwidth or terminating location in the path. For video calls, the video location bandwidth takes into account both the audio and the video portions of the video call.

Therefore, for a video call, no bandwidth is deducted from the audio bandwidth pool. The same applies to immersive video calls. The devices that can specify membership in a location include:. The Enhanced Location Call Admission Control mechanism also takes into account the mid-call changes in call binary option system 9 bandwidth.

For example, if an inter-site video call is established, Unified CM will subtract the appropriate amount of video bandwidth from the respective locations and links in the path. If this video call changes to an audio-only call as the result of a transfer to a device that is not capable of video, Unified CM will return the allocated bandwidth to the video pool and allocate the appropriate amount of bandwidth from the audio pool along the same path.

Calls that change from binary option system 9 bandwidth to video will cause the opposite change of bandwidth allocation. Table lists the amount of bandwidth requested by the static locations algorithm for various call speeds. For example, a G. For a video call, Unified CM counts only the media bit rates for both the audio and video streams. For example, for a video call at a bit rate of kbps, Unified CM will allocate kbps from the video bandwidth allocation.

For a complete list of codecs and location and link bandwidth values, refer to the binary option system 9 bandwidth calculations information in the Call Admission Control section of the Cisco Unified Communications Manager System Guideavailable at. The link between locations can also support different numbers of video calls depending on the video and audio codecs being used for example, one video call requesting kbps of bandwidth or three video calls with each requesting kbps of bandwidth.

When a binary option system 9 bandwidth is placed from one location to the other, Unified CM deducts the appropriate amount of bandwidth from the effective path of locations and links from one location to another. Using Figure as an example, a G. When the call has completed, Unified CM returns the bandwidth to those same links over the effective path. If there is not enough bandwidth at any one of the links over the path, the call is denied by Unified CM and the caller receives the network busy tone.

If the calling device is an IP phone with a display, that device also displays the message "Not Enough Bandwidth. In such cases, the calls are redirected to the target binary option system 9 bandwidth in the Call Forward No Answer field of the called device. Locations work in conjunction with regions to define the characteristics of a call over the effective path of locations and links.

Regions define the type of compression or bit rate 8 kbps or G. You assign each device in the system to both a region by means of a device pool and a location by means of a device pool or by direct configuration on the device itself.

You can configure locations in Unified CM to define:.

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