Table Of Contents
Device Support
Supported Devices
Device Configuration Files
Device Firmware Loads
Updating Device Loads
Device Pools
Call Preservation
Call Preservation Scenarios
Where to Find More Information
Device Support
This section provides general information about how Cisco Unified Communications Manager interacts with Cisco Unified Communications devices in your network and covers the following topics:
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Supported Devices
•Device Configuration Files
•Device Firmware Loads
•Device Pools
•Call Preservation
•Where to Find More Information
Supported Devices
The Cisco Unified Communications Manager supports many types of devices, including those in the following list:
•Cisco Unified IP Phones
•Analog gateway ports
•T1 gateway
•E1 gateway
•Transcoding resource
•Software Media Termination Point (MTP)
•Annunciator
•Conference resource (hardware)
•Conference resource (software)
•CTI port (TAPI and JTAPI)
•Cisco IP Softphone
•Messaging (voice mail)
•Intercluster trunk
•SIP trunks
•Video inputs
Device Configuration Files
The Cisco Trivial File Transfer Protocol (Cisco TFTP) builds configuration files from information that is found in the Cisco Unified Communications Manager database.
The device-specific configuration files use the name format SEP, SAA, SDA, CFB, VGC, or MTP + MAC address:
•SEP—Selsius Ethernet Phone (Cisco IP Phone 12 SP+, Cisco IP Phone 30 VIP, Cisco Unified IP Phone 7902, Cisco Unified IP Phone 7905, Cisco Unified IP Phone 7906, Cisco Unified IP Phone 7910, Cisco Unified IP Phone 7911, Cisco Unified IP Phone 7912, Cisco Unified IP Phone 7920, Cisco Unified IP Phone 7921, Cisco Unified IP Phone 7931, Cisco Unified IP Phone 7935, Cisco Unified IP Phone 7936, Cisco Unified IP Phone 7940, Cisco Unified IP Phone 7941, Cisco Unified IP Phone 7960, Cisco Unified IP Phone 7961, Cisco Unified IP Phone 7970, and Cisco Unified IP Phone 7971)
•SAA—Selsius Analog Access (Cisco Catalyst 6000 24 Port FXS Analog Interface Module)
•SDA—Selsius Digital Access (Cisco Catalyst 6000 8 Port Voice E1/T1)
•VGC—Cisco VG248 Analog Phone Gateway (Cisco VG248 ports and units appear as distinct devices in the same Cisco Unified Communications Manager. All 48 device ports register within the same Cisco Unified Communications Manager cluster as device type "Cisco VGC Phone.")
•MTP—Media Termination Point
Configuration files also contain a list of Cisco Unified Communications Managers in priority order. Network addresses comprise either the fully qualified domain name, for example, "cm1.cisco.com," or dotted IP address "172.116.21.12" plus a TCP port. See the "Cisco TFTP" section on page 10-1 for more information.
When a device needs to get its configuration file, the device sends a TFTP request for the device-specific configuration filename.
Note You can specify button URLs in device configuration for Cisco Unified IP Phone 7970, 7960, and 7940. If the URL is blank, Cisco Unified Communications Manager uses the enterprise values. Refer to the "Enterprise Parameters Configuration" chapter in the Cisco Unified Communications Manager Administration Guide.
Device Firmware Loads
Loads comprise files that contain updated firmware for devices. Four types of firmware loads exist: phone loads, gateway loads, MTP loads, and conference bridge loads. During installation or upgrade, Cisco Unified Communications Manager provides the latest loads; however, you can also receive a load between releases that can contain patches or other information that is important to the devices that use loads, such as phones or gateways.
The /usr/local/cm/tftp subdirectory stores these load files as *.bin, .zup, or .sbin files; for example, D501A022.bin. During installation or upgrade, this location stores the latest loads. You must copy new loads that you receive between releases to this location for the system to access them.
To view the most current information on load descriptions for each device type, choose Device > Device Defaults and click the ? button.
Updating Device Loads
You can apply a new load to a single device before applying it as a systemwide default. This method can prove useful for testing purposes. Remember, however, that only the device that you have updated with the new load will use that load. All other devices of that type use the old load until you update the systemwide defaults for that device with the new load.
Device Pools
Device pools scale and simplify the distribution of Cisco Unified Communications Manager redundancy groups. A device pool allows the following primary attributes to be assigned globally to a device:
•Cisco Unified Communications Manager Group—This group specifies a list of up to three Cisco Unified Communications Managers, which can be used for call processing in a prioritized list.
•Date/Time Group—Date/Time group specifies the date and time zone for a device.
•Region—You require regions only if multiple voice codecs are used within an enterprise. Regions define the voice codecs that are used within and between regions.
•SRST Reference—Disable or use default gateway for SRST.
•Connection Monitor Duration—Change the length of time that the IP phone monitors its connection to Cisco Unified Communications Manager before it unregisters from SRST and reregisters to Cisco Unified Communications Manager.
Optional calling search space can prevent rogue installations of IP phones on your network. For example, rogue phones that are plugged into the network autoregister in a device pool that has a calling search space that is restricted only to the Cisco Unified Communications Manager administrator. This search space can have a Primary Line Automatic Ringdown that is assigned to it, so, when the user goes off hook, the call immediately connects to security or the Cisco Unified Communications Manager administrator.
Typically, the following scenario applies with respect to configuring device pools. The deployment model drives the exact model of clustering and device pools that are used:
•Redundancy for single-site cluster, multisite WAN centralized call processing, and multisite WAN distributed call processing—Device pool configuration uses Cisco Unified Communications Manager groups as redundancy basis. For example, a cluster can have up to eight Cisco Unified Communications Manager servers: A, B, C, D, E, F, G, and H; four configured as active and four configured as backup. Using 1:1 redundancy, the groups would comprise servers AB, CD, EF, and GH. Using 1:1 redundancy with load balancing, the groups would comprise AB, BA, CD, DC, EF, FE, GH, and HG.
Note A Cisco Unified Communications Manager cluster with more than 20,000 IP phones requires 1:1 redundancy. You may also configure 2:1 redundancy for smaller clusters; for example, AC, BC, DF, and EF, where ABDE comprise primary servers, and CF comprise the backup servers.
•Region requirements for single-site cluster—This scenario does not require use of regions because all calls use the G.711 codec for calls.
•Region requirements for multisite WAN centralized and distributed call processing—Each cluster could potentially have a G.711 and G.729 region per Cisco Unified Communications Manager redundancy group.
•Total device pools = Number of sites x regions.
Total device pools = Regions x Cisco Unified Communications Manager redundancy groups.
Refer to the "Device Pool Configuration" chapter in the Cisco Unified Communications Manager Administration Guide for information on how to configure device pools.
Call Preservation
The call preservation feature of Cisco Unified Communications Manager ensures that an active call does not get interrupted when a Cisco Unified Communications Manager fails or when communication fails between the device and the Cisco Unified Communications Manager that set up the call.
Cisco Unified Communications Manager supports full call preservation for an extended set of Cisco Unified Communications devices. This support includes call preservation between Cisco Unified IP Phones, Media Gateway Control Protocol (MGCP) gateways that support Foreign Exchange Office (FXO) (non-loop-start trunks) and Foreign Exchange Station (FXS) interfaces, and, to a lesser extent, conference bridge, MTP, and transcoding resource devices.
Enable H.323 call preservation by setting the advanced service parameter, Allow Peer to Preserve H.323 Calls, to True. For information on configuring service parameters and accessing advanced service parameters, refer to the "Configuring Service Parameters for a Service on a Server" section in the Cisco Unified Communications Manager Administration Guide.
The following devices and applications support call preservation. If both parties connect through one of the following devices, Cisco Unified Communications Manager maintains call preservation:
•Cisco Unified IP Phones
•Software conference bridge
•Software MTP
•Hardware conference bridge (Cisco Catalyst 6000 8 Port Voice E1/T1 and Services Module, Cisco Catalyst 4000 Access Gateway Module)
•Transcoder (Cisco Catalyst 6000 8 Port Voice E1/T1 and Services Module, Cisco Catalyst 4000 Access Gateway Module)
•Non-IOS MGCP gateways (Catalyst 6000 24 Port FXS Analog Interface Module, Cisco DT24+, Cisco DE30+, Cisco VG200)
•Cisco IOS H.323 gateways (such as Cisco 2800 series, Cisco 3800 series)
•Cisco IOS MGCP Gateways (Cisco VG200, Catalyst 4000 Access Gateway Module, Cisco 2620, Cisco 3620, Cisco 3640, Cisco 3660, Cisco 3810)
•Cisco VG248 Analog Phone Gateway
•Cisco Unified Communications Manager Attendant Console
The following devices and applications do not support call preservation:
•Annunciator
•H.323 endpoints such as NetMeeting or third-party H.323 endpoints
•CTI applications
•TAPI applications
•JTAPI applications
Call Preservation Scenarios
Table 11-1 lists and describes how call preservation is handled in various scenarios.
Table 11-1 Call Preservation Scenarios
Scenario
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Call Preservation Handling
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Cisco Unified Communications Manager fails.
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A Cisco Unified Communications Manager failure causes the call-processing function for all calls that were set up through the failed Cisco Unified Communications Manager to be lost.
The affected devices recognize that their current Cisco Unified Communications Manager failed. Similarly, the other Cisco Unified Communications Managers in the cluster detect the Cisco Unified Communications Manager failure.
Cisco Unified Communications Manager maintains affected active calls until the end user hangs up or until the devices can determine that the media connection has been released. Users cannot invoke any call-processing features for calls that are maintained as a result of this failure.
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Communication failure occurs between Cisco Unified Communications Manager and device.
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When communication fails between a device and the Cisco Unified Communications Manager that controls it, the device recognizes the failure and maintains active connections. The Cisco Unified Communications Manager recognizes the communication failure and clears call-processing entities that are associated with calls in the device where communication was lost.
The Cisco Unified Communications Managers still maintain control of the surviving devices that are associated with the affected calls. Cisco Unified Communications Manager maintains affected active calls until the end user hangs up or until the devices can determine that the media connection has been released. Users cannot invoke any call-processing features for calls that are maintained as a result of this failure.
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Device failure
(Phone, gateway, conference bridge, transcoder, MTP)
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When a device fails, the connections that exist through the device stop streaming media. The active Cisco Unified Communications Manager recognizes the device failure and clears call-processing entities that are associated with calls in the failed device.
The Cisco Unified Communications Managers maintain control of the surviving devices that are associated with the affected calls. Cisco Unified Communications Manager maintains the active connections (calls) that are associated with the surviving devices until the surviving end users hang up or until the surviving devices can determine that the media connection has been released.
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Cisco Unified Communications Manager Attendant Console
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Call preservation does not apply for Computer Telephony Integration (CTI) route point devices because a call only gets accepted for redirect. If a Cisco Unified Communications Manager goes down before the call gets extended to Telephony Call Dispatcher (TCD), the call does not transfer to TCD. If the Cisco Unified Communications Manager goes down before the call arrives at a phone after TCD redirects the call, the call will be lost.
The attendant console inherits call preservation from the phone because it is a third-party control for a phone. Any active calls continue after Cisco Unified Communications Manager goes down, but calls on hold do not. The attendant console only supports call preservation via the associated phone.
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Where to Find More Information
Related Topics
•Cisco TFTP, page 10-1
•Understanding Cisco Unified Communications Manager Voice Gateways, page 40-1
•Cisco Unified IP Phones, page 44-1
Additional Cisco Documentation
•Device Defaults Configuration, Cisco Unified Communications Manager Administration Guide
•Device Pool Configuration, Cisco Unified Communications Manager Administration Guide
•Gateway Configuration, Cisco Unified Communications Manager Administration Guide
•Cisco Unified IP Phone Configuration, Cisco Unified Communications Manager Administration Guide
•Cisco Unified Communications Manager Group Configuration, Cisco Unified Communications Manager Administration Guide
•Date/Time Group Configuration, Cisco Unified Communications Manager Administration Guide
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