C H A P T E R
51
SRST Fallback Mode
•
Prerequisites for SRST Fallback Mode, page 1537
•
Restrictions for SRST Fallback Mode, page 1537
•
Information About SRST Fallback Mode, page 1538
•
Configure SRST Fallback Mode, page 1542
•
Configuration Examples for SRST Fallback Mode, page 1547
•
Feature Information for SRST Fallback Mode, page 1550
Prerequisites for SRST Fallback Mode
• The IP address of the Cisco Unified CME router must be registered as the SRST reference on the
Cisco Unified Communications Manager device pool.
• Cisco Unified CME 4.0 or a later version must be installed on the Cisco Unified CME router that is configured in SRST mode.
• Following tasks must be completed:
◦ Generate Configuration Files for Phones, on page 386
◦ Configure System-Level Parameters, on page 167
. Note that the max-dn command must be explicity configured with the preference keyword to support calls between PSTN and IP phones during
SRST fallback mode.
◦ Configure Call Transfer and Forwarding, on page 1176
Restrictions for SRST Fallback Mode
• The call-manager-fallback command, which is used to configure Cisco Unified SRST, cannot be used on a router that is configured for Cisco Unified CME.
• The telephony-service setup command and auto assign command must not be enabled on a
Cisco Unified CME router configured for SRST fallback mode. If you used the telephony-service setup
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Information About SRST Fallback Mode
command before configuring the router for SRST fallback support, you must remove any unwanted ephone directory numbers created by the setup process.
• The number of phones that fall back to a Cisco Unified CME router in SRST mode cannot exceed the maximum number of phones that is supported by the router. To find the maximum number of phones for a particular router and Cisco Unified CME version, see the appropriate Cisco CME Supported
Firmware, Platforms, Memory, and Voice Products document at http://www.cisco.com/en/US/products/ sw/voicesw/ps4625/products_device_support_tables_list.html
.
• The ephone-dns and ephones that are created from fallback may have less information associated with them than appears in their original configuration on a Cisco Unified Communications Manager or on an active Cisco Unified CME system. This situation occurs because the Cisco Unified CME router in
SRST mode is designed to learn only a limited amount of information from the fallback IP phones. For example, if an ephone-dn has in its configuration the command number 4888 no-reg (to keep that extension from registering under its E.164 address), after fallback the no-reg part of this command will be lost because this information cannot be learned from the IP phones.
• The order of the SRST fallback ephone-dns and ephones will be different from the order of the active
Cisco Unified Communications Manager or Cisco Unified CME ephone-dns and ephones. For example, ephone 1 on an active Cisco Unified Communications Manager might be numbered ephone 5 on the
Cisco Unified CME router in SRST mode, because the order of learned ephone-dns and ephones is determined by the sequence of the ephone fallback occurrence, which is random.
Information About SRST Fallback Mode
SRST Fallback Mode Using Cisco Unified CME
This feature enables routers to provide call-handling support for Cisco Unified IP phones if they lose connection to remote primary, secondary, or tertiary Cisco Unified Communications Manager installations or if the WAN connection is down. When Cisco Unified SRST functionality is provided by Cisco Unified CME, provisioning of phones is automatic and most Cisco Unified CME features are available to the phones during periods of fallback, including hunt-groups, call park and access to Cisco Unity voice messaging services using SCCP protocol. The benefit is that Cisco Unified Communications Manager users will gain access to more features during fallback without any additional licensing costs.
This feature offers a limited telephony feature set during fallback mode. Customers who require the following features should continue to use Cisco Unified SRST, because these features are not supported with SRST fallback support using Cisco Unified CME.
• More than 240 phones during fallback service
• Cisco VG 248 Analog Phone Gateway support
• Secure voice fallback during SRST fallback service
• Simple, one-time configuration for SRST fallback service
Cisco Unified Communications Manager supports Cisco Unified IP phones at remote sites attached to
Cisco Integrated Services Routers across the WAN. This new feature combines the many features available in Cisco Unified CME with the ability to automatically detect IP phone configurations that is available in
Cisco Unified SRST to provide seamless call handling when communication with the
Cisco Unified Communications Manager is interrupted.
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SRST Fallback Mode Using Cisco Unified CME
When the system automatically detects a failure, Cisco Unified SRST uses Simple Network Auto Provisioning
(SNAP) technology to auto-configure a branch office router to provide call processing for the Cisco Unified IP phones that are registered with the router. When the WAN link or connection to the primary
Cisco Unified Communications Manager is restored, call handling returns to the primary
Cisco Unified Communications Manager.
A limited number of phone features are automatically detected at the time that call processing falls back to
Cisco Unified CME in SRST Fallback Mode, and an advantage of SRST fallback support using
Cisco Unified CME is that you can choose to prebuild a Cisco Unified CME configuration that contains a number of extensions (ephone-dns) with additional features that you want them to have for some or all of your extensions. The configurations will contain ephone-dn configurations but will not identify which phones
(which MAC addresses) will be associated with which ephone-dns (extension numbers).
By copying and pasting a prebuilt configuration onto Cisco Unified CME routers at several locations, you can use the same overall configuration for sites that are identically laid out. For example, if you have a number of retail stores, each with five to ten checkout registers, you can use the same overall configuration in each store. You might use a range of extensions from 1101 to 1110. Stores with fewer than ten registers will simply not use some of the ephone-dn entries you provide in the configuration. Stores with more extensions than you have prebuilt will use the auto-provisioning feature to populate their extra phones. The only configuration variations from store to store will be the specific MAC addresses of the individual phones, which are added to the configurations at the time of fallback.
When a phone registers for SRST service with a Cisco Unified CME router and the router discovers that the phone was configured with a specific extension number, the router searches for an existing prebuilt ephone-dn with that extension number and then assigns that ephone-dn number to the phone. If there is no prebuilt ephone-dn with that extension number, the Cisco Unified CME system automatically creates one. In this way, extensions without prebuilt configurations are automatically populated with extension numbers and features as the numbers and features are “learned” by the Cisco Unified CME router in SRST mode when the phone registers to the router after a WAN link fails.
The SRST fallback support using Cisco Unified CME feature is able to interrogate phones to learn their MAC addresses and the extension-to-ephone relationships associated with each phone. This information is used to dynamically create and execute the Cisco Unified CME button command for each phone and automatically provision each phone with the extensions and features you want it to have.
The following sequence describes how Cisco Unified CME provides SRST services for
Cisco Unified Communications Manager phones when they lose connectivity with the
Cisco Unified Communications Manager and fall back to the Cisco Unified CME router in SRST mode:
Before Fallback
1
Phones are configured as usual in Cisco Unified Communications Manager.
2
The IP address of the Cisco Unified CME router is registered as the SRST reference on the
Cisco Unified Communications Manager device pool.
3
SRST mode is enabled on the Cisco Unified CME router.
4
(Optional) Ephone-dns and features are prebuilt on the Cisco Unified CME router.
During Fallback
1
Phones that are enabled for fallback register to the default Cisco Unified CME router that has SRST mode enabled. Each display-enabled IP phone displays the message that has been defined using the system
message command under telephony-service configuration mode. By default, this message is
“Cisco Unified CME.”
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SRST Fallback Mode Using Cisco Unified CME
2
While the fallback phones are registering, the router in SRST mode initiates an interrogation of the phones in order to learn their phone and extension configurations. The following information is acquired or
“learned” by the router:
• MAC address
• Number of lines or buttons
• Ephone-dn-to-button relationship
• Speed-dial numbers
3
The option defined with the srst mode auto-provision command determines whether Cisco Unified CME adds the learned phone and extension information to its running configuration. If the information is added, it appears in the output when you use the show running-config command and is saved to NVRAM when you use the write command.
• Use the srst mode auto-provision none command to enable the Cisco Unified CME router to provide
SRST fallback services for Cisco Unified Communications Manager.
• If you use the srst mode auto-provision dn or srst mode auto-provision all commands, the
Cisco Unified CME router includes the phone configuration it learns from
Cisco Unified Communications Manager in its running configuration. If you then save the configuration, the fallback phones are treated as locally configured phones on the
Cisco Unified CME-SRST router which could adversely impact the fallback behavior of those phones.
4
While in fallback mode, Cisco Unified IP phones periodically attempt to reestablish a connection with
Cisco Unified Communications Manager every 120 seconds (default). To manually reestablish a connection to Cisco Unified Communications Manager you can reboot the Cisco Unified IP phone.
5
When a connection is reestablished with Cisco Unified Communications Manager, Cisco Unified IP phones automatically cancel their registration with the Cisco Unified CME router in SRST mode. However, if a
WAN link is unstable, Cisco Unified IP phones can bounce between
Cisco Unified Communications Manager and the Cisco Unified CME router in SRST mode.
An IP phone connected to the Cisco Unified CME-SRST router over a WAN reconnects itself to
Cisco Unified Communications Manager as soon as it can establish a connection to
Cisco Unified Communications Manager over the WAN link. However, if the WAN link is unstable, the IP phone switches back and forth between Cisco Unified CME-SRST and Cisco Unified Communications Manager, causing temporary loss of phone service (no dial tone). These reconnect attempts, known as WAN link flapping issues, continue until the IP phone successfully reconnects itself back to
Cisco Unified Communications Manager.
WAN link disruptions can be classified into two types: infrequent random outages that occur on an otherwise stable WAN, and sporadic, frequent disruptions that last a few minutes.
To resolve WAN-link flapping issues between Cisco Unified Communications Manager and SRST,
Cisco Unified Communications Manager provides an enterprise parameter and a setting in the Device Pool
Configuration window called Connection Monitor Duration. (Depending on system requirements, the administrator decides which parameter to use.) The value of the parameter is delivered to the IP phone in the
XML configuration file.
• Use the enterprise parameter to change the connection duration monitor value for all IP phones in the
Cisco Unified Communications Manager cluster. The default for the enterprise parameter is 120 seconds.
• Use the Device Pool Configuration window to change the connection duration monitor value for all IP phones in a specific device pool.
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Prebuilding Cisco Unified CME Phone Configurations
A Cisco Unified IP phone will not reestablish a connection with the primary
Cisco Unified Communications Manager at the central office if it is engaged in an active call.
After the First Fallback
Additional features can be set up, such as ephone hunt groups, which can contain learned extensions and prebuilt extensions. The complete core set of Cisco Unified CME phone features is available to the IP phones and extensions, whether they are learned or configured.
Figure 71: SRST Fallback Support using Cisco Unified CME
shows a branch office with several
Cisco Unified IP phones connected to a Cisco Unified CME router in SRST fallback mode. The router provides connections to both a WAN link and the PSTN. The Cisco Unified IP phones connect to their primary
Cisco Unified Communications Manager at the central office via this WAN link. Cisco Unified CME provides
SRST services for the phones when connectivity over the WAN link is interrupted.
Figure 71: SRST Fallback Support using Cisco Unified CME
Prebuilding Cisco Unified CME Phone Configurations
Prebuilding Cisco Unified CME ephone-dns allows you to create a set of directory numbers with extension numbers and some features, which will provide service during fallback that is similar to the service that is provided during normal operation. You can prebuild all of your normal extensions, a limited set of your extensions, or none of your extensions. Directory numbers that are not prebuilt will be populated with extension numbers and features as they are “learned” by the Cisco Unified CME router in SRST mode at the time of fallback.
An ephone-dn is the IP equivalent of a normal phone line in most cases. It represents a potential call connection and is associated with a virtual voice port and virtual dial peer. An ephone-dn has one or more extension or telephone numbers associated with it, which allow call connections to be made. An ephone-dn can be single-line, which allows one call connection to be made at a time, or dual-line, which allows two simultaneous call connections. Dual-line ephone-dns are useful for features such as call transfer or call waiting, in which one
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Auto provision Directory Numbers in SRST Fallback Mode
call is put on hold to connect to another. Single-line ephone-dns are required for certain features such as intercom, paging, and message-waiting indication (MWI). For more information, see
Cisco Unified CME
Overview, on page 67
.
If an ephone-dn is manually configured in Cisco Unified CME, incoming calls will always route to the manually configured ephone-dn in Cisco Unified CME rather than to Cisco Unified Communications Manager using the voip dial peer. To avoid incorrect routing, configure a higher preference for the voip dial peer than the preference for the prebuilt directory number. For configuration example, see
Example for Prebuilding DNs,
on page 1550 .
Auto provision Directory Numbers in SRST Fallback Mode
Cisco Unified CME 4.3 and later versions support octo-line directory numbers in SRST fallback mode. You can specify whether Cisco Unified CME in SRST fallback mode creates octo-line or dual-line directory numbers based on the phone type. For the Cisco Unified IP Phone 7902 or 7920, or an analog phone connected to the Cisco VG224 or Cisco ATA, the system creates a dual-line directory number; it creates an octo-line directory number for all other phone types. This applies only to the ephone-dns that are “learned” automatically from ephone configuration information, and not to ephone-dns that are manually configured in
Cisco Unified CME.
Configure SRST Fallback Mode
Enable SRST Fallback Mode
Restriction
Do not enable the telephony-service setup command or auto assign command on a Cisco Unified CME router that you are configuring for SRST fallback mode. If you used the telephony-service setup command previously on the router, you must remove any unwanted ephone directory numbers created by the setup process.
SUMMARY STEPS
1. enable
2. configure terminal
3. telephony-service
4. srst mode auto-provision {all | dn | none}
5. srst dn line-mode {dual | dual-octo | octo | single}
6. srst dn template template-tag
7. srst ephone template template-tag
8. srst ephone description string
9. end
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Enable SRST Fallback Mode
DETAILED STEPS
Step 1
Step 2
Step 3
Step 4
Step 5
Command or Action enable
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
Example:
Router> enable
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
telephony-service
Enters telephony-service configuration mode.
Example:
Router(config)# telephony-service
srst mode auto-provision {all | dn |
none}
Example:
Router(config-telephony)# srst mode auto-provision none
Enables SRST mode for a Cisco Unified CME router.
• all—Includes information for learned ephones and ephone-dns in the running configuration.
• dn—Includes information for learned ephone-dns in the running configuration.
• none—Does not include information for learned ephones or learned ephone-dns in the running configuration. Use this keyword when you want Cisco Unified CME to provide SRST fallback services for
Cisco Unified Communications Manager.
srst dn line-mode {dual | dual-octo | octo
| single}
(Optional) Specifies the line mode for ephone-dns in SRST mode on a
Cisco Unified CME router.
Example:
Router(config-telephony)# srst dn line-mode dual-octo
• dual—SRST fallback ephone-dns are dual-line ephone-dns.
• dual-octo—SRST fallback ephone-dns are dual-line or octo-line, depending on the phone type. This keyword is supported in
Cisco Unified CME 4.3 and later versions.
• octo—SRST fallback ephone-dns are octo-line. This keyword is supported in Cisco Unified CME 4.3 and later versions.
• single—SRST fallback ephone-dns are single-line ephone-dns. Default value.
Note
This command is used only when ephone-dns are learned at the time of fallback. It is ignored when you prebuild ephone-dn configurations.
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Verify SRST Fallback Mode
Step 6
Step 7
Step 8
Step 9
Command or Action
srst dn template template-tag
Example:
Router(config-telephony)# srst dn template 3
Purpose
(Optional) Specifies an ephone-dn template to be used in SRST mode on a
Cisco Unified CME router. The template includes features that were specified when the template was created. See
Example for Configuring Templates for
Fallback Support: Example, on page 1549
.
• template-tag—identifying number of an existing ephone-dn template.
Range is 1 to 15.
srst ephone template template-tag
Example:
Router(config-telephony)# srst ephone template 5
(Optional) Specifies an ephone template to be used in SRST mode on a
Cisco Unified CME router.
• template-tag—identifying number of an existing ephone template.
Range is 1 to 20.
srst ephone description string
Example:
Router(config-telephony)# srst ephone description Cisco Unified CME
SRST Fallback
(Optional) Specifies a description to be associated with an ephone learned in SRST mode on a Cisco Unified CME router.
• string—Description to be associated with an ephone. Maximum string length is 100 characters.
end
Returns to privileged EXEC mode.
Example:
Router(config-telephony)# end
Verify SRST Fallback Mode
Step 1
Use the show telephony-service all or the show running-config command to verify that SRST fallback mode has been set on this router.
Example:
telephony-service srst mode auto-provision all srst ephone template 5 srst ephone description srst fallback auto-provision phone : Jul 07 2005 17:45:08 srst dn template 8 srst dn line-mode dual load 7960-7940 P00305000600 max-ephones 30 max-dn 60 preference 0 ip source-address 10.1.68.78 port 2000 max-redirect 20 system message "SRST Mode: Cisco Unified CME
’ keepalive 10 max-conferences 8 gain -6 moh welcome.au
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Prebuilding Cisco Unified CME Phone Configurations
Step 2
Step 3
create cnf-files version-stamp Jan 01 2002 00:00:00
Use the show telephony-service ephone-dn command during fallback to review ephone-dn configurations. Learned ephone-dns are noted by a line stating that they were learned during SRST fallback.
Note
Learned ephone-dns do not appear in the output for the show running-config command if the none keyword is used in the srst mode auto-provision command.
Example:
ephone-dn 1 dual-line number 4008 name 4008 description 4008 preference 0 secondary 9 huntstop no huntstop channel call-waiting beep ephone-dn-template 8
This DN is learned from srst fallback ephones
Use the show telephony-service ephone command during fallback to review ephone configurations. Learned ephones are noted by a line stating that they were learned during SRST fallback.
Note
Learned ephones do not appear in the output for the show running-config command if the none keyword is used in the srst mode auto-provision command.
Example:
ephone 1 mac-address 0112.80B3.9C16
button 1:1 multicast-moh ephone-template 5
Always send media packets to this router: No
Preferred codec: g711ulaw user-locale JP network-locale US
Description: "YOUR Description" : Oct 11 2005 09:58:27
This is a srst fallback phone
Prebuilding Cisco Unified CME Phone Configurations
You can optionally create a set of ephone-dns that are preconfigured with extension numbers and some features to provide service during fallback that is similar to the service that is provided during normal operation.
Extensions that are not prebuilt are populated with extension numbers and features as they are “learned” by the Cisco Unified CME router in SRST mode at the time of fallback.
Note
To avoid incorrect routing when you prebuild ephone-dns for Cisco Unified Communications Manager phones in Cisco Unified CME, use the preference command in ephone-dn and voip-dial-peer configuration mode to create a higher preference (0 being the highest) for the voip dial peer than the preference for the prebuilt directory number. For configuration example, see
Example for Prebuilding DNs, on page 1550
.
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Modify Call Pickup for Fallback Support
See the following procedures to set up a few of the most common features to associate with phones in fallback mode:
•
Create Directory Numbers for SCCP Phones, on page 253
•
Enable Call Park or Directed Call Park, on page 1087
•
Create an Ephone Template, on page 1426
•
Create an Ephone-dn Template, on page 1428
•
Configure Ephone-Hunt Groups on SCCP Phones, on page 1289
Note
Note that the dial-peer hunt command must be configured for hunt-selection order of explicit preference to support hunt groups during SRST fallback mode.
Modify Call Pickup for Fallback Support
An especially useful feature for fallback phones is modifying the behavior of the Pickup soft key in
Cisco Unified CME to match that of the Pickup soft key in Cisco Unified Communications Manager. To modify the call pickup feature for fallback support, perform the following steps.
SUMMARY STEPS
1. enable
2. configure terminal
3. telephony-service
4. no service directed-pickup
5. create cnf-files
6. reset all
7. exit
DETAILED STEPS
Step 1
Step 2
Command or Action enable
Example:
Router> enable
configure terminal
Example:
Router# configure terminal
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
Enters global configuration mode.
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Configuration Examples for SRST Fallback Mode
Step 3
Step 4
Step 5
Step 6
Step 7
Command or Action telephony-service
Example:
Router(config)# telephony-service
no service directed-pickup
Example:
Router(telephony)# no service directed-pickup
create cnf-files
Example:
Router(telephony)# create cnf-files
reset all
Example:
Router(telephony)# reset all
exit
Example:
Router(telephony)# exit
Purpose
Enters telephony-service configuration mode.
(Optional) Disables directed call pickup and changes the behavior of the PickUp soft key so that a user pressing it invokes local group pickup rather than directed call pickup. This behavior is consistent with that of the PickUp soft key in Cisco Unified Communications
Manager.
Note
For changes to the service-phone settings to be effective, the Sep*.conf.xml file must be updated with the create
cnf-files command and the phone units must rebooted with the reset command.
Builds XML configuration files for Cisco Unified IP phones.
Resets all phones.
Exits dial-peer configuration mode.
Configuration Examples for SRST Fallback Mode
Example for Enabling SRST Mode
The following example enables SRST mode on the Cisco Unified CME router. It specifies that learned fallback ephone-dns should be created in dual-line mode and use ephone-dn template 3 for their configuration parameters.
Learned ephones will use the parameters in ephone template 5 and a description will be associated with the phones.
telephony-service max-ephones 30 max-dn 60 preference 0 srst mode auto-provision all srst dn line-mode dual srst dn template 3
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Example for Provisioning Directory Numbers for Fallback Support
.
.
.
srst ephone description srst fallback auto-provision phone srst ephone template 5
The following excerpt from the show running-config command displays the configuration of ephone 1, which was learned during fallback; the description is stamped with the date and time that the show running-config command was used. The configuration of ephone 2, which was prebuilt rather than learned, is shown for comparison.
ephone 1 description srst fallback auto-provision phone : Jul 07 2005 17:45:08 ephone-template 5 mac-address 100A.7052.2AAE
button 1:1 2:2 ephone 2 mac-address 1002.CD64.A24A
type 7960 button 1:3
The following excerpt from the show running-config command displays the configuration of ephone-dn 1 through ephone-dn 3. All three ephones are learned ephone-dns that are configured in dual-line mode and use ephone-dn template 5, as specified in the telephony-service configuration mode commands.
ephone-dn 1 dual-line number 7001 description 7001 name 7001
!
ephone-dn-template 5
This DN is learned from srst fallback ephones
!
ephone-dn 2 dual-line number 4005 name 4005 ephone-dn-template 5
This DN is learned from srst fallback ephones
!
!
ephone-dn 3 dual-line number 4002 label 4002 name 4002 ephone-dn-template 5
This DN is learned from srst fallback ephones
Example for Provisioning Directory Numbers for Fallback Support
The following example sets up five ephone-dns and two call-park slots that are used for fallback phones.
ephone-dn 1 number 1101 name Register 1 ephone-dn 2 number 1102 name Register 2 ephone-dn 3 number 1103 name Register 3 ephone-dn 4 number 1104
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Example for Configuring Templates for Fallback Support: Example
name Register 4 ephone-dn 5 number 1105 name Register 5 ephone-dn 21 number 1121 name Park Slot 1 park-slot timeout 60 limit 3 recall alternate 1100 ephone-dn 22 number 1122 name Park Slot 2 park-slot timeout 60 limit 3 recall alternate 1100
Example for Configuring Templates for Fallback Support: Example
The following example creates ephone-dn template 3 and ephone template 5 that will be used with the SRST fallback support using Cisco Unified CME feature. Ephone-dn template 3 adds the fallback phones to pickup group 24 and specifies call forwarding for busy and no-answer conditions to extension 1100. Ephone template
5 defines two fastdial numbers that will appear as menu entries displayed from the Directories > Local
Services > Personal Speed Dials option on the fallback phones, and also specifies the softkey layouts for the fallback phones.
ephone-dn-template 3 pickup-group 24 call-forward busy 1100 call-forward noan 1100 timeout 45 ephone-template 5 fastdial 1 1101 name Front Register fastdial 2 918005550111 Headquarters softkeys idle Newcall Cfwdall Pickup softkeys seized Endcall Cfwdall Pickup softkeys alerting Endcall softkeys connected Endcall Hold Park Trnsfer
Example for Enabling Hunt Groups for Fallback Support
The following example configures the dial peers to hunt in the following order: (1) explicit preference, (2) longest match in phone number, and (3) random selection. The dial-peer hunt command must be configured for hunt-selection order of explicit preference to support hunt groups during SRST fallback mode.
dial-peer hunt 2
The following example creates a peer hunt group with the pilot number 1111.
ephone-hunt 3 peer pilot 1111 list 1101, 1102, 1103 hops 3 timeout 25 final 1100
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Example for Modifying Call Pickup for Fallback Support
Example for Modifying Call Pickup for Fallback Support
The following example changes the behavior of the Pickup soft key to be like the one in
Cisco Unified Communications Manager.
telephony-service no service directed-pickup create cnf-files
Example for Prebuilding DNs
In the following partial example, the preference command in ephone-dn and voip-dial-peer configuration mode is configured to create a voip dial peer with a higher preference (0) than the preference (1) of the manually-configured directory number (ephone-dn 1).
dial-peer voice 1002 voip destination-pattern
.
.
.
preference 0
1019
<<=====This dial peer has precedence and will match first.
ephone-dn 1 number
1019
preference 1
<<======Configure lower preference for prebuilt DN.
Feature Information for SRST Fallback Mode
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support.
To access Cisco Feature Navigator, go to www.cisco.com/go/cfn . An account on Cisco.com is not required.
Table 118: Feature Information for SRST Fallback Mode
Feature Name
Octo-Line Directory Numbers
SRST Fallback Support Using
Cisco Unified CME
Cisco Unified CME Version
4.3
4.0
Feature Information
Support for octo-line directory numbers was added.
SRST fallback support using
Cisco Unified CME was introduced.
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