© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Implementation of Multiple Site Deployment Configuring Cisco Unified SRST

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Overview of SRST Gateways Provide call-handling support for Cisco IP phones when they lose connection to remote Cisco Unified CallManager servers WAN failure Server breakdown Automatically detect a failure and use SNAP to autoconfigure the branch office router Used in centralized Cisco Unified CallManager deployments Different feature sets for SCCP and SIP SRST Licensed on number of users at remote site on Cisco IOS PLUS software

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v SRST Functionality Cisco Unified CallManager SCCP/SIP Cisco Unified SRST Router X Remote site loses connectivity to the Cisco Unified CallManager. IP phones register with SRST gateway using SCCP/SIP. Connectivity to the central site is maintained using PSTN fallback. Modified calling privileges could exist during fallback operation. Keepalives Failed T1/E1 ISDN SCCP/SIP IP WAN PSTN

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Major SRST Features Support for IP phones to use call processing on local router upon Cisco Unified CallManager fallback Extension-to-extension and extension-to-PSTN dialing Multiple lines per IP phone Consultative call transfer, call hold, pickup, and hunt groups Caller ID information and ANI support Calling-party name display Last-number redial Additional language options Customized system message Multicast MOH from flash and live-feed Secure SRST Video

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v SRST Router Platform and IP Phone Support Use Cisco Feature Navigator to get a list of Cisco IOS releases that support a particular version of Cisco Unified SRST. Check this link for Cisco Unified CallManager compatibility: cmcomp.htm Most Cisco IP phones are supported by Cisco Unified SRST. Cisco Unified SRST supports these telephony signaling systems: FXS, FXO, T1, E1, and E1 R2 signals Cisco SRST version 3.2 and later supports all PRI and BRI switches.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v SRST Phone Registration Process Registered to Cisco Unified CallManager X WAN connection fails Phone registers with SRST router SRST router pulls IP phone configuration Phone fully associated with SRST router WAN connection restored Keepalives from Cisco Unified CallManager received IP phone under full control of Cisco Unified CallManager Phone registers with Cisco Unified CallManager again SCCP Keepalives every 30 sec. IP PhoneSRST Router Keepalives every 30 sec.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v SRST Commands call-manager-fallback router(config)# Enables the gateway fallback feature and enters call-manager- fallback configuration mode ccm-manager fallback-mgcp router(config)# Enables the gateway fallback feature and allows an MGCP voice gateway to provide call-processing services through SRST when Cisco Unified CallManager is unavailable

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v SRST Commands (Cont.) call application alternate [application-name] or service [alternate | default] service-name location router(config)# Specifies that the default voice application takes over if the MGCP application is not available, or loads and configures a specific, standalone application on a dial peer. Use either of these commands, depending on Cisco IOS version. keepalive seconds router(config-cm-fallback)# Sets the time interval, in seconds, between keepalive messages that are sent to the router by Cisco IP phones Default is 30

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SRST for SCCP Support IP WAN PSTN SRST Router Cisco Unified CallManager 1. Enable SRST and enter its configuration mode 2. Define IP address and port that SRST service binds to 3. Define maximum number of directory numbers to support 4. Define maximum number of IP phones to support 5. Create Cisco Unified CallManager SRST reference 6. Associate SRST reference with device pool Line 1: 2001 Line 2: 3001 Line 1: 2002 Line 2: 3002 Line 1: 2003 Line 2: 3003

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SRST Router for SCCP Support ip source-address ip-address [port port][any-match | strict-match] router(config-cm-fallback)# Enables the router to receive messages from the Cisco IP phones through the specified IP addresses and provides for strict IP address verification Optionally, changes the default SCCP port number 2000

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SRST Router for SCCP Support (Cont.) max-dn max-directory-numbers [dual-line] [preference preference-order] router(config-cm-fallback)# Sets the maximum number of directory numbers or virtual voice ports that can be supported by the SRST router and activates the dual-line mode max-ephones max-phones router(config-cm-fallback)# Configures the maximum number of Cisco IP phones that can be supported by the SRST router

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SRST Router for SCCP Support Example SRST Router Cisco Unified CallManager Line 1: 2001 Line 2: 3001 Line 1: 2002 Line 2: 3002 Line 1: 2003 Line 2: 3003 SRST#configure terminal SRST(config)#call-manager-fallback SRST(config-cm-fallback)# ip source-address port 2000 SRST(config-cm-fallback)# max-ephones 3 SRST(config-cm-fallback)# max-dn 6 SRST(config-cm-fallback)#end SRST# IP WAN PSTN

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SRST Reference in Cisco Unified CallManager Configure an SRST reference that will become a part of IP phone configuration file Assign SRST router an IP address and SCCP port

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Associating SRST Reference with Device Pool in Cisco Unified CallManager Apply SRST reference to IP phone through the device pool

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Selects a language by country to display on Cisco IP Phone 7940 and Cisco IP Phone 7960 Configuring Additional SRST Features for SCCP user-locale country-code Router(config-cm-fallback)# Sets the maximum number of simultaneous three-party conferences supported by the SRST router The maximum number possible is platform-dependent max-conferences max-conference-numbers Router(config-cm-fallback)# Enables MOH during G.711, OnNet VoIP, and PSTN calls moh filename Router(config-cm-fallback)#

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v IP WAN PSTN Configuring SIP SRST SIP SRST Registrar (B2BUA) Cisco Unified CallManager (SIP Proxy) SIP Phones X 1. Allow SIP-to-SIP calls on SIP SRST router 2. Enable SIP registrar functionality on SIP SRST router 3. Configure a voice register pool 4. Define phones in register pool 5. Enter voice register global configuration mode and define maximum number of register pools supported 6. Create Cisco Unified CallManager SIP SRST reference

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SIP SRST: Allow SIP-to-SIP Calls voice service voip router(config)# Enters voice service configuration mode allow-connections sip to sip router(config-voi-srv)# Enables VoIP-to-VoIP call connections using SIP

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SIP SRST: Enable SIP Registrar sip router(config-voi-srv)# Enters SIP configuration mode registrar server [expires [max sec] [min sec]] router(conf-serv-sip)# Enables SIP registrar functionality on SIP SRST router

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SIP SRST: Register Pools voice register pool tag router(config)# Enters voice register pool configuration mode for SIP phones id {network address mask mask | ip address mask mask | mac address} router(config-register-pool)# Explicitly identifies a locally available individual or set of SIP IP phones

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SIP SRST: Maximum Number of Register Pools Supported voice register global router(config)# Enters voice register global configuration mode to set global parameters for all supported Cisco SIP phones in a Cisco Unified SIP SRST environment max-pool max-voice-register-pools router(config-register-global)# Defines maximum number of SIP phones supported in a Cisco Unified SIP SRST environment Router(config)# voice register global Router(config-register-global)# max-pool 24 Sets the maximum number of Cisco SIP IP phones in SIP SRST environment to 24

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SIP SRST Example SIP SRST Registrar (B2BUA) Cisco Unified CallManager (SIP Proxy) SIP Phones IP WAN PSTN SRST#configure terminal SRST(config)# voice service voip SRST(config-voi-srv)# allow-connections sip to sip SRST(config-voi-srv)#exit SRST(config)# sip SRST(config-serv-sip)# registrar server SRST(config-voi-srv)#exit SRST(config)# voice register global SRST(config-register-global)# max-pool 10 SRST(config-voi-srv)#exit SRST(config)# voice register pool 1 SRST(config-register-pool)# id network mask SRST(config)#end

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Configuring SIP SRST Reference in Cisco Unified CallManager Configure SIP SRST reference: Enter SIP SRST router IP address Enter SIP SRST router port to listen for SIP messages

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Verifying SRST Operation show running-config router# Use this command to verify the SRST router configuration. show call-manager-fallback all router# Use this command to verify that the Cisco SRST feature is enabled. show ephone router# Use this command to display the Cisco IP phones that have registered to the Cisco SRST router.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Verifying SRST Operation (Cont.) debug ephone register router# Use this command to display the Cisco IP phones that have registered to the Cisco SRST router. Optionally, verify on IP phones: Use the Network Settings display on the Cisco IP phone to verify that the SRST device on the phones matches the IP address of the Cisco SRST router. Cisco IP phones display a message informing you that they are operating in Cisco Unified CallManager fallback mode.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Summary SRST is a Cisco mechanism to ensure operation of the remote branch site IP phones if the Cisco Unified CallManager is not available. SRST provides a subset of Cisco Unified CallManager call- processing capabilities in the remote office. When keepalives to Cisco Unified CallManager fail, branch office IP phones register with the local SRST router, which pulls their current configuration. For most basic SRST operation supporting SCCP IP phones, only the SRST router IP address and port where SRST service binds have to be defined.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v Summary (Cont.) You can also configure the maximum number of SRST- supported IP phones and directory numbers Cisco Unified SIP SRST router operates as a backup SIP registrar to Cisco Unified CallManager, acting as SIP proxy. Cisco Unified SIP SRST router registrar function has to be enabled. In Cisco Unified CallManager, an SRST reference is added and then applied to IP phones through their device pool. SRST operation verification can be performed either from SRST router or on IP phone display.

© 2006 Cisco Systems, Inc. All rights reserved. CIPT1 v