Cisco Unified SRST 4.0: Overview

Table Of Contents

Overview of Cisco Unified SRST

Contents

Cisco Unified SRST Description

H.323 Gateways and SRST

MGCP Gateways and SRST

Support for Cisco Unified IP Phones, Platforms, Cisco Unified CallManager, Signals, Languages, and Switches

Finding Cisco IOS Software Releases That Support Cisco Unified SRST

Cisco Unified IP Phone Support

Platform and Memory Support

Cisco Unified CallManager Compatibility

Signal Support

Language Support

Switch Support

Prerequisites for Configuring Cisco Unified SRST

Installing Cisco Unified CallManager

Installing Cisco Unified SRST

Integrating Cisco Unified SRST with Cisco Unified CallManager

Restrictions for Configuring Cisco Unified SRST

Where to Go Next

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Overview of Cisco Unified SRST

This chapter describes Cisco Unified Survivable Remote Site Telephony (Cisco Unified SRST) and what it does. It also includes information about Cisco Unified IP Phone, platform, and Cisco Unified CallManager version support; specifications; features; restrictions; and where to find additional reference documents.

Note Prior to version 4.0, the name of this product was Cisco SRST.

Note For the most up-to-date information about Cisco Unified IP Phone support, the maximum number of Cisco Unified IP Phones, maximum DNs or virtual voice ports, and memory requirements for Cisco Unified SRST, see the Cisco Unified SRST 4.0 Supported Firmware, Platforms, Memory, and Voice Products at http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2169/prod_installation_guide09186a00805f6f1b.html.

Contents

• Cisco Unified SRST Description

• Support for Cisco Unified IP Phones, Platforms, Cisco Unified CallManager, Signals, Languages, and Switches

• Prerequisites for Configuring Cisco Unified SRST

• Restrictions for Configuring Cisco Unified SRST

• Where to Go Next

• Additional References

Cisco Unified SRST Description

Cisco Unified SRST provides Cisco Unified CallManager with fallback support for Cisco IP phones that are attached to a Cisco router on your local network. Cisco Unified SRST enables routers to provide call-handling support for Cisco IP phones when they lose connection to remote primary, secondary, or tertiary Cisco Unified CallManager installations or when the WAN connection is down.

Cisco Unified CallManager supports Cisco IP phones at remote sites attached to Cisco multiservice routers across the WAN. Prior to Cisco Unified SRST, when the WAN connection between a router and the Cisco Unified CallManager failed or when connectivity with Cisco Unified CallManager was lost for some reason, Cisco IP phones on the network became unusable for the duration of the failure. Cisco Unified SRST overcomes this problem and ensures that the Cisco IP phones offer continuous (although minimal) service by providing call-handling support for Cisco IP phones directly from the Cisco Unified SRST router. The system automatically detects a failure and uses Simple Network Auto Provisioning (SNAP) technology to autoconfigure the branch office router to provide call processing for Cisco IP phones that are registered with the router. When the WAN link or connection to the primary Cisco Unified CallManager is restored, call handling reverts back to the primary Cisco Unified CallManager.

When Cisco IP phones lose contact with primary, secondary, and tertiary Cisco Unified CallManagers, they must establish a connection to a local Cisco Unified SRST router to sustain the call-processing capability necessary to place and receive calls. The Cisco IP phone retains the IP address of the local Cisco Unified SRST router as a default router in the Network Configuration area of the Settings menu. The Settings menu supports a maximum of five default router entries; however, Cisco Unified CallManager accommodates a maximum of three entries. When a secondary Cisco Unified CallManager is not available on the network, the local Cisco Unified SRST router's IP address is retained as the standby connection for Cisco Unified CallManager during normal operation.

Note Cisco Unified CallManager fallback mode telephone service is available only to those Cisco IP phones that are supported by a Cisco Unified SRST router. Other Cisco IP phones on the network remain out of service until they reestablish a connection with their primary, secondary, or tertiary Cisco Unified CallManager.

Typically, it takes three times the keepalive period for a phone to discover that its connection to Cisco Unified CallManager has failed. The default keepalive period is 30 seconds. If the phone has an active standby connection established with a Cisco Unified SRST router, the fallback process takes 10 to 20 seconds after connection with Cisco Unified CallManager is lost. An active standby connection to a Cisco Unified SRST router exists only if the phone has the location of a single Cisco Unified CallManager in its Unified CallManager list. Otherwise, the phone activates a standby connection to its secondary Cisco Unified CallManager.

Note The time it takes for an IP phone to fallback to the SRST router can vary depending on the phone type. Phones such as the Cisco 7902, Cisco 7905, and Cisco 7912 can take approximately 2.5 minutes to fallback to SRST mode.

If a Cisco IP phone has multiple Cisco Unified CallManagers in its CallManager list, it progresses through its list of secondary and tertiary Cisco Unified CallManagers before attempting to connect with its local Cisco Unified SRST router. Therefore, the time that passes before the Cisco IP phone eventually establishes a connection with the Cisco Unified SRST router increases with each attempt to contact to a Cisco Unified CallManager. Assuming that each attempt to connect to a Cisco Unified CallManager takes about one minute, the Cisco IP phone in question could remain offline for three minutes or more following a WAN link failure.

Note During a WAN connection failure, when Cisco Unified SRST is enabled, Cisco IP phones display a message informing you that they are operating in Cisco Unified CallManager fallback mode. The Cisco IP Phone 7960G and Cisco IP Phone 7940G display a "CM Fallback Service Operating" message, and the Cisco IP Phone 7910 displays a "CM Fallback Service" message when operating in Cisco Unified CallManager fallback mode. When the Cisco Unified CallManager is restored, the message goes away and full Cisco IP phone functionality is restored.

While in Cisco Unified CallManager fallback mode, Cisco IP phones periodically attempt to reestablish a connection with Cisco Unified CallManager at the central office. Generally the default time that Cisco IP phones wait before attempting to reestablish a connection to a remote Cisco Unified CallManager is 120 seconds. The time can be changed in Cisco Unified CallManager; see the "Device Pool Configuration Settings" chapter in the Cisco Unified CallManager Administration Guide. A manual reboot can immediately reconnect Cisco Unified IP Phones to Cisco Unified CallManager.

Once a connection is reestablished with Cisco Unified CallManager, Cisco IP phones automatically cancel their registration with the Cisco Unified SRST router. However, if a WAN link is unstable, Cisco IP phones can bounce between Cisco Unified CallManager and Cisco Unified SRST. A Cisco IP phone cannot reestablish a connection with the primary Cisco Unified CallManager at the central office if it is currently engaged in an active call.

Figure 1 shows a branch office with several Cisco IP phones connected to a Cisco Unified SRST router. The router provides connections to both a WAN link and the PSTN. The Cisco IP phones connect to their primary Cisco Unified CallManager at the central office via this WAN link.

Figure 1 Branch Office Cisco IP Phones Connected to a Remote Central Cisco Unified CallManager

Figure 2 shows the same branch office telephone network with the WAN connection down. In this situation, the Cisco IP phones use the Cisco Unified SRST router as a fallback for their primary Cisco Unified CallManager. The branch office Cisco IP phones are connected to the PSTN through the Cisco Unified SRST router and are able to make and receive off-net calls.

Figure 2 Branch Office Cisco IP Phones Operating in SRST Mode

H.323 Gateways and SRST

On H.323 gateways, when the WAN link fails, active calls from Cisco Unified IP Phones to the PSTN are not maintained by default. Call preservation may work with the no h225 timeout keepalive command, but call preservation using the no h225 timeout keepalive command is not officially supported by Cisco Technical Support.

Under default configuration, the H.323 gateway maintains a keepalive signal with Cisco Unified CallManager and terminates H.323-to-PSTN calls if the keepalive signal fails, for example if the WAN link fails. To disable this behavior and help preserve existing calls from local IP phones, you can use the no h225 timeout keepalive command. Disabling the keepalive mechanism only affects calls that will be torn down as a result of the loss of the H.225 keepalive signal. For information regarding disconnecting a call when an inactive condition is detected. see the Media Inactive Call Detection document.

MGCP Gateways and SRST

MGCP fallback is a different feature than SRST and, when configured as an individual feature, can be used by a PSTN gateway. To use SRST as your fallback mode on an MGCP gateway, SRST and MGCP fallback must both be configured on the same gateway. MGCP and SRST have had the capability to be configured on the same gateway since Cisco IOS Release 12.2(11)T.

To make outbound calls while in SRST mode on your MGCP gateway, two fallback commands must be configured on the MGCP gateway. These two commands allow SRST to assume control over the voice port and over call processing on the MGCP gateway. With Cisco IOS releases prior to 12.3(14)T, the two commands are the ccm-manager fallback-mgcp and call application alternate commands. With Cisco IOS releases after 12.3(14)T, the ccm-manager fallback-mgcp and service commands must be configured. A complete configuration for these commands is shown in the section "Enabling SRST on an MGCP Gateway" section on page 40.

Note The commands listed above are ineffective unless both commands are configured. For instance, your configuration will not work if you only configure the ccm-manager fallback-mgcp command.

For more information on the fallback methods for MGCP gateways, see the Configuring MGCP Gateway Support for Cisco Unified CallManager document or the MGCP Gateway Fallback Transition to Default H.323 Session Application document.

Support for Cisco Unified IP Phones, Platforms, Cisco Unified CallManager, Signals, Languages, and Switches

The following sections provide information about Cisco Feature Navigator and the histories of Cisco Unified IP Phone, platform, and Cisco Unified CallManager support from Cisco SRST Version 1.0 to the present version of Cisco Unified SRST.

• Finding Cisco IOS Software Releases That Support Cisco Unified SRST

• Cisco Unified IP Phone Support

• Platform and Memory Support

• Cisco Unified CallManager Compatibility

• Signal Support

• Language Support

• Switch Support

Finding Cisco IOS Software Releases That Support Cisco Unified SRST

The tables in this chapter list only the Cisco IOS software releases that first introduce new features to Cisco Unified SRST. Other Cisco IOS software releases may subsequently inherit versions of Cisco Unified SRST. To get a list of Cisco IOS software releases that support a particular version of Cisco Unified SRST, use Cisco Feature Navigator.

Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.

To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:

http://tools.cisco.com/RPF/register/register.do

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

http://www.cisco.com/go/fn

Cisco Unified IP Phone Support

For the most up-to-date information about Cisco Unified IP Phone support, see the Cisco Unified SRST 4.0 Supported Firmware, Platforms, Memory, and Voice Products at http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2169/prod_installation_guide09186a00805f6f1b.html.

The following IP phones are supported by Cisco Unified SRST 4.0:

•Cisco Analog Telephone Adaptor (ATA) 186 and Cisco ATA 188 Version 2.16 and higher with Cisco Unified CallManager 3.3 and higher

Cisco Unified SRST supports Cisco ATA 186 and Cisco ATA 188 using Skinny Client Control Protocol (SCCP) for voice calls only

Note For ATAs that are registered to a Cisco Unified SRST system to participate in FAX calls, they must have their ConnectMode parameter set to use the "standard payload type 0/8" as the RTP payload type in FAX passthrough mode. For ATAs used with Cisco Unified SRST 4.0 and higher systems, this is done by setting bit 2 of the ConnectMode parameter to 1 on the ATA. For more information, see the "Parameters and Defaults" chapter in the Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for SCCP (version 3.0), at http://www.cisco.com/en/US/products/hw/gatecont/ps514/products_administration_guide_chapter09186a00801e0e00.html.

•Cisco Unified IP Phone 7902G

•Cisco Unified IP Phone 7905G

•Cisco Unified IP Phone 7910

•Cisco Unified IP Phone 7911G

•Cisco Unified IP Phone 7912G

•Cisco Unified IP Phone Expansion Module 7914

•Cisco Unified Wireless IP Phone 7920

•Cisco IP Conference Station 7935

•Cisco Unified IP Conference Station 7936

•Cisco Unified IP Phone 7940G

•Cisco Unified IP Phone 7941G, Cisco Unified IP Phone 7941G-GE

•Cisco Unified IP Phone 7960G

•Cisco UnifiedIP Phone 7961G, Cisco UnifiedIP Phone 7961G-GE

•Cisco Unified IP Phone 7970G

•Cisco Unified IP Phone 7971G-GE

•Cisco VG224 Analog Phone Gateway, IOS Version 12.4(4)XC with Cisco Unified SRST 4.0 running Cisco IOS Software Release 12.4(4)XC and later. For configuration information see, the "Enabling Fallback to Cisco Unified SRST on the Voice Gateway" section in SCCP Controlled Analog (FXS) Ports with Supplementary Features in Cisco IOS Gateways at http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a0080483a76.html#wp1301293.

•Cisco VG248 Analog Phone Gateway Version 1.2(1) and higher

Note During Cisco Unified CallManager fallback, Cisco Unified SRST considers the Cisco VG248 to be a group of Cisco Unified IP Phones. Cisco Unified SRST counts each of the 48 ports on the Cisco VG248 as a separate Cisco IP phone. Support for Cisco VG248 Version 1.2(1) and higher is available as of Cisco SRST Version 2.1. For more information, see the Cisco VG248 Analog Phone Gateway Data Sheet and the Cisco VG248 Analog Phone Gateway Version 1.2(1) Release Notes.

Platform and Memory Support

For the most up-to-date information about the maximum number of Cisco Unified IP Phones, maximum DNs or virtual voice ports, and memory requirements for Cisco Unified SRST, see the Cisco Unified SRST 4.0 Supported Firmware, Platforms, Memory, and Voice Products at http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2169/prod_installation_guide09186a00805f6f1b.html.

Determining Platform Support Through Cisco Feature Navigator

Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Availability of Cisco IOS Software Images

Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, see the online release notes or, if supported, Cisco Feature Navigator.

Note For the most up-to-date information about Cisco IOS software images, see the Cisco Unified SRST 4.0 Supported Firmware, Platforms, Memory, and Voice Products at http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2169/prod_installation_guide09186a00805f6f1b.html.

Cisco Unified CallManager Compatibility

See the Cisco Unified CallManager Compatibility Matrix.

Signal Support

Cisco Unified SRST supports FXS, FXO, T1, E1, and E1 R2 signals.

Language Support

Cisco SRST 3.2 and later supports the following languages:

•Danish

•Dutch

•English

•French

•German

•Italian

•Japanese Katakana (available under Cisco Unified CallManager 4.0 or later).

•Norwegian

•Portuguese

•Russian

•Spanish

•Swedish

Note The Cisco Unified IP Phone 7911G, Cisco Unified IP Phone 7941G and 7941G-GE, Cisco Unified IP Phone 7961G and 7961G-GE, Cisco Unified IP Phone 7970G, and Cisco Unified IP Phone 7971G-GE support English only.

Switch Support

Cisco SRST version 3.2 and later supports all PRI and BRI switches, including the following:

•basic-1tr6

•basic-5ess

•basic-dms100

•basic-net3

•basic-ni

•basic-ntt NTT switch type for Japan

•basic-ts013

•primary-4ess Lucent 4ESS switch type for the United States

•primary-5ess Lucent 5ESS switch type for the United States

•primary-dms100 Northern Telecom DMS-100 switch type for the United States

•primary-net5 NET5 switch type for the United Kingdom, Europe, Asia, and Australia

•primary-ni National ISDN switch type for the United States

•primary-ntt NTT switch type for Japan

•primary-qsig QSIG switch type

•primary-ts014 TS014 switch type for Australia (obsolete)

Prerequisites for Configuring Cisco Unified SRST

Before configuring Cisco Unified SRST you must do the following:

•You have an account on Cisco.com to download software.

To obtain an account on Cisco.com, go to www.cisco.com and click Register at the top of the screen.

•You have purchased a Cisco Unified SRST license.

To purchase a license, go to http://www.cisco.com/cgi-bin/tablebuild.pl/ip-key.

•Choose an appropriate Cisco Unified SRST version. Each SRST version supports a specific set of IP phones, memory requirements, features, and directory numbers (DNs). See the "Platform and Memory Support" section and the "Restrictions for Configuring Cisco Unified SRST" section.

•Choose an appropriate phoneload. SRST only supports certain phoneloads that have been tested with the various Cisco Unified CallManager versions. For the most up-to-date phoneloads, see the Cisco Unified SRST 4.0 Supported Firmware, Platforms, Memory, and Voice Products at http://www.cisco.com/en/US/customer/products/sw/voicesw/ps2169/prod_installation_guide09186a00805f6f1b.html.

•If you have Cisco Unified CallManager already installed, verify that your version of Cisco Unified CallManager is compatible with your Cisco Unified SRST release. See the "Cisco Unified CallManager Compatibility" section.

Installing Cisco Unified CallManager

When installing Cisco Unified CallManager consider the following:

•Follow the installation instructions under the appropriate Cisco Unified CallManager version listed at http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/index.htm.

•Integrate Cisco Unified SRST with Cisco Unified CallManager. Integration is performed from Cisco Unified CallManager. See "Integrating Cisco Unified SRST with Cisco Unified CallManager" section

Installing Cisco Unified SRST

Cisco Unified SRST versions have different installation instructions:

• Installing Cisco SRST V3.0 and Later

• Installing Cisco SRST V2.0 and V2.1

• Installing Cisco SRST V1.0

To update Cisco Unified SRST, follow the installation instructions described in this section.

Installing Cisco SRST V3.0 and Later

Install the Cisco IOS software release image containing the Cisco SRST or Cisco Unified SRST version that is compatible with your Cisco Unified CallManager version. See the "Cisco Unified CallManager Compatibility" section. Cisco IOS software can be downloaded from the Cisco Software Center at http://www.cisco.com/public/sw-center/.

Cisco SRST and Cisco Unified SRST can be configured to support continuous multicast output of music on hold (MOH) from a flash MOH file in flash memory. For more information, see the "Configuring MOH from Flash Files" section on page 102. If you plan use music on hold, go to the Technical Support Software Download site at http://www.cisco.com/cgi-bin/tablebuild.pl/ip-iostsp and copy the music-on-hold.au file to the flash memory on your Cisco SRST or Cisco Unified SRST router.

Installing Cisco SRST V2.0 and V2.1

Download and install Cisco SRST V2.0 or Cisco SRST V2.1 from the Cisco Software Center at http://www.cisco.com/public/sw-center/.

Installing Cisco SRST V1.0

Cisco SRST V1.0 runs with Cisco CallManager V3.0.5 only. It is recommended that you upgrade to the latest Cisco Unified CallManager and Cisco Unified SRST versions.

Integrating Cisco Unified SRST with Cisco Unified CallManager

There are two procedures for integrating Cisco Unified SRST with Cisco Unified CallManager. Procedure selection depends on the Cisco Unified CallManager version that you have.

If You Have Cisco CallManager V3.3 or Later

If you have Cisco CallManager V3.3 or later, you must create an SRST reference and apply it to a device pool. An SRST reference is the IP address of the Cisco SRST router.

Step 1 Create an SRST reference.

a. From any page in Cisco CallManager, click System and SRST.

b. On the Find and List SRST References page, click Add a New SRST Reference.

c. On the SRST Reference Configuration page, enter a name in the SRST Reference Name field and the IP address of the Cisco SRST router in the IP Address field.

d. Click Insert.

Step 2 Apply the SRST reference or the default gateway to one or more device pools.

a. From any page in Cisco CallManager, click System and Device Pool.

b. On the Device Pool Configuration page, click on the desired device pool icon.

c. On the Device Pool Configuration page, choose an SRST reference or "Use Default Gateway" from the SRST Reference field's menu.

If You Have Cisco CallManager Prior to V3.3

If you have firmware versions that enable Cisco Unified SRST by default, no additional configuration is required on Cisco CallManager to support Cisco Unified SRST. If your firmware versions disable Cisco Unified SRST by default, you must enable Cisco Unified SRST for each phone configuration.

Step 1 Go to the Cisco CallManager Phone Configuration page.

a. From any page in Cisco CallManager, click Device and Phone.

b. In the Find and List Phones page, click Find.

c. After a list of phones appears, click on the desired device name.

d. The Phone Configuration appears.

Step 2 In the Phone Configuration page, go to the Product Specific Configuration section at the end of the page, choose Enabled from the Cisco Unified SRST field's menu, and click Update.

Step 3 Go to the Phone Configuration page for the next phone and choose Enabled from the Cisco Unified SRST field's menu by repeating Step 1 and Step 2.

Restrictions for Configuring Cisco Unified SRST

Table 4 provides a history of restrictions from Cisco SRST Version 1.0 to the present version of Cisco Unified SRST.

Table 4 History of Restrictions from Cisco SRST V1.0 to the Present Cisco Unified SRST Version

Cisco SRST
Version

Cisco IOS
Release

Restrictions

Version 4.0

12.4(4)XC

•All of the restrictions in Cisco SRST Version 1.0.

•Call transfer is supported only on the following:

–VoIP H.323, VoFR, and VoATM between Cisco gateways running Cisco IOS Release 12.2(11)T and using the H.323 nonstandard information element

–FXO and FXS loop-start (analog)

–FXO and FXS ground-start (analog)

–Ear and mouth (E&M) (analog) and DID (analog)

–T1 channel-associated signaling (CAS) with FXO and FXS ground-start signaling

–T1 CAS with E&M signaling

–All PRI and BRI switch types

•The following Cisco Unified IP Phone function keys are dimmed because they are not supported during SRST operation:

–MeetMe

–GPickUp (group pickup)

–Park

–Confrn (conference)

•Although the Cisco IAD2420 series integrated access devices (IADs) support the Cisco Unified SRST feature, this feature is not recommended as a solution for enterprise branch offices.

Version 3.4

12.4(4)T

Version 3.3

12.3(14)T

Version 3.2

12.3(11)T

Version 3.1

12.3(7)T

Version 3.0

12.2(15)ZJ

Version 2.1

12.2(15)T

Version 2.02

12.2(13)T

Version 2.01

12.2(11)T

Version 2.0

12.2(8)T1

Version 2.0

12.2(8)T

Version 2.0

12.2(2)XT

Version 1.0

12.2(2)XB

•Does not support first generation Cisco Unified IP Phones, such as Cisco IP Phone 30 VIP and Cisco IP Phone 12 SP+.

•Does not support other Cisco Unified CallManager applications or services: Cisco IP SoftPhone, Cisco uOne—Voice and Unified Messaging Application, or Cisco IP Contact Center.

•Does not support Centralized Automatic Message Accounting (CAMA) trunks on the Cisco 3660 routers.

Note If you are in one of the states in the United States of America where there is a regulatory requirement for CAMA trunks to interface to 911 emergency services, and you would like to connect more than 48 Cisco Unified IP Phones to the Cisco 3660 multiservice routers in your network, contact your local Cisco account team for help in understanding and meeting the CAMA regulatory requirements.

12.2(2)XG

12.1(5)YD

Where to Go Next

The next chapters of this guide describe how to configure Cisco Unified SRST. As shown in Table 5, each chapter takes you through these tasks in the order in which they need to be performed. The first task for configuring Cisco Unified SRST is to ensure that the basic software and hardware in your system is configured correctly for Cisco Unified SRST. For instructions, see the "Prerequisites for Configuring Cisco Unified SRST" section.

Table 5 Cisco Unified SRST Configuration Sequence

Task

Where Task Is Described

1. Setting up a Cisco Unified SRST system to communicate with your network

" Setting Up the Network" chapter

2. Setting up the basic Cisco Unified SRST phone configuration

" Setting Up Cisco Unified IP Phones" chapter

3. Configuring incoming and outgoing calls

" Setting Up Call Handling" chapter

4. Configuring optional system and phone parameters

" Configuring Additional Call Features" chapter

5. Configuring optional security for SRST

" Setting Up Secure Survivable Remote Site Telephony" chapter

6. Setting up voice mail

" Integrating Voice Mail with Cisco Unified SRST" chapter

Additional References

The following sections provide additional references related to Cisco Unified SRST:

• Related Documents

• Standards

• MIBs

• RFCs

• Technical Assistance

Related Documents

Related Topic

Documents

SRST Commands

• Cisco Unified SRST and Cisco Unified SIP SRST Command Reference (All Versions)

Cisco Unified IP Phones

• Cisco 7900 Series IP Phones End-User Guides

Command reference and configuration information for voice and telephony commands

• Cisco IOS Voice Command Reference

•Cisco IOS Debug Command Reference Go to http://www.cisco.com/en/US/products/sw/iosswrel/tsd_products_support_category_home.html and click the appropriate Cisco IOS Software Release and Command References.

Configuring SRST and MGCP Fallback

• Configuring MGCP Gateway Support for Cisco Unified CallManager

• MGCP Gateway Fallback Transition to Default H.323 Session Application

• Configuring SRS Telephony and MGCP Fallback

Cisco Unified CallManager user documentation

• Cisco Unified CallManager

DHCP

• Cisco IOS DHCP Server

Media Inactive Call Detection

• Media Inactive Call Detection

Standard Preface

• Cisco IOS Voice Configuration Library Preface

Standard Glossary

• Cisco IOS Voice Configuration Library Glossary

Standards

Standard

Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—

MIBs

MIB

MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—

Technical Assistance

Description

Link

The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport

Cisco SRST Version	Cisco IOS Release	Restrictions
Version 4.0	12.4(4)XC	•All of the restrictions in Cisco SRST Version 1.0. •Call transfer is supported only on the following: –VoIP H.323, VoFR, and VoATM between Cisco gateways running Cisco IOS Release 12.2(11)T and using the H.323 nonstandard information element –FXO and FXS loop-start (analog) –FXO and FXS ground-start (analog) –Ear and mouth (E&M) (analog) and DID (analog) –T1 channel-associated signaling (CAS) with FXO and FXS ground-start signaling –T1 CAS with E&M signaling –All PRI and BRI switch types •The following Cisco Unified IP Phone function keys are dimmed because they are not supported during SRST operation: –MeetMe –GPickUp (group pickup) –Park –Confrn (conference) •Although the Cisco IAD2420 series integrated access devices (IADs) support the Cisco Unified SRST feature, this feature is not recommended as a solution for enterprise branch offices.
Version 3.4	12.4(4)T
Version 3.3	12.3(14)T
Version 3.2	12.3(11)T
Version 3.1	12.3(7)T
Version 3.0	12.2(15)ZJ
Version 2.1	12.2(15)T
Version 2.02	12.2(13)T
Version 2.01	12.2(11)T
Version 2.0	12.2(8)T1
Version 2.0	12.2(8)T
Version 2.0	12.2(2)XT
Version 1.0	12.2(2)XB	•Does not support first generation Cisco Unified IP Phones, such as Cisco IP Phone 30 VIP and Cisco IP Phone 12 SP+. •Does not support other Cisco Unified CallManager applications or services: Cisco IP SoftPhone, Cisco uOne—Voice and Unified Messaging Application, or Cisco IP Contact Center. •Does not support Centralized Automatic Message Accounting (CAMA) trunks on the Cisco 3660 routers. Note If you are in one of the states in the United States of America where there is a regulatory requirement for CAMA trunks to interface to 911 emergency services, and you would like to connect more than 48 Cisco Unified IP Phones to the Cisco 3660 multiservice routers in your network, contact your local Cisco account team for help in understanding and meeting the CAMA regulatory requirements.
	12.2(2)XG
	12.1(5)YD
	12.1(5)YD

Task	Where Task Is Described
1. Setting up a Cisco Unified SRST system to communicate with your network	" Setting Up the Network" chapter
2. Setting up the basic Cisco Unified SRST phone configuration	" Setting Up Cisco Unified IP Phones" chapter
3. Configuring incoming and outgoing calls	" Setting Up Call Handling" chapter
4. Configuring optional system and phone parameters	" Configuring Additional Call Features" chapter
5. Configuring optional security for SRST	" Setting Up Secure Survivable Remote Site Telephony" chapter
6. Setting up voice mail	" Integrating Voice Mail with Cisco Unified SRST" chapter

Related Topic	Documents
SRST Commands	• Cisco Unified SRST and Cisco Unified SIP SRST Command Reference (All Versions)
Cisco Unified IP Phones	• Cisco 7900 Series IP Phones End-User Guides
Command reference and configuration information for voice and telephony commands	• Cisco IOS Voice Command Reference •Cisco IOS Debug Command Reference Go to http://www.cisco.com/en/US/products/sw/iosswrel/tsd_products_support_category_home.html and click the appropriate Cisco IOS Software Release and Command References.
Configuring SRST and MGCP Fallback	• Configuring MGCP Gateway Support for Cisco Unified CallManager • MGCP Gateway Fallback Transition to Default H.323 Session Application • Configuring SRS Telephony and MGCP Fallback
Cisco Unified CallManager user documentation	• Cisco Unified CallManager
DHCP	• Cisco IOS DHCP Server
Media Inactive Call Detection	• Media Inactive Call Detection
Standard Preface	• Cisco IOS Voice Configuration Library Preface
Standard Glossary	• Cisco IOS Voice Configuration Library Glossary