© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Designing Cisco CallManager Express and Cisco Unity Express Networks Describing Deployment Scenarios and Design Considerations

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Outline Overview Standalone Cisco CallManager Express Cisco CallManager Express in SIP Network Cisco CallManager Express Integration with Cisco CallManager Cisco CallManager Express Migration to Cisco CallManager and SRST Cisco CallManager Express H.323 Interoperability Solutions Summary

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Standalone Cisco CallManager Express Simple deployment Scales up to 240 IP Phones and 720 voice ports CUE module can be located in same chassis as the Cisco CallManager Express router CUE module can be located in a chassis that is separate from the Cisco CallManager Express router PSTN for incoming and outgoing calls –Analog: FXO and E&M –Digital: BRI, PRI, T1, E1 WAN connection for Internet, , chat, etc.

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Standalone Cisco CallManager Express (Cont.) Single physical site Small- to medium-sized businesses Cannot scale above 240 ephones ATA Internet PSTN Cisco CallManager Express/CUE

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express in SIP Network Integration with a SIP-based network Inbound calls to Cisco CallManager Express IP Phones from a SIP network Outbound calls from Cisco CallManager Express IP Phones to a SIP network Direct attachment of SIP IP Phones to Cisco CallManager Express is not supported Call transfer is supported Call forward is supported SIP interface with the BTS is possible

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express in SIP Network (Cont.) SIP Site Cisco CallManager Express, CUE – Localized Call Processing SIP Integration SIP support in dial peers is an IOS software function Use either the notify-based DTMF relay mechanism that is proprietary to Cisco or RFC 2833–based DTMF relay Cisco CallManager Express router must be configured if E.164 numbers are going to register with the SIP registrar server SIP Invite, Redirect, or Refer PSTN IP WAN

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express Integration with Cisco CallManager CallManager 3.3(3) or greater Connection to Cisco CallManager is through the H.323 protocol Connection through a QoS-enabled WAN link Cisco CallManager does not support H.450 protocols SIP connection in the future

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express Integration with Cisco CallManager (Cont.) SRST, CUE Router Networked Location A Branch Office Applications (UM, IVR, IPCC, etc.) Central Site Cisco CallManager Cluster – Central Call Processing Cisco CallManager Express, CUE – Localized Call Processing Fat pipe PSTN QoS- enabled IP WAN Cisco CallManager Phones Cisco CallManager Express Phones

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Voice mail Cisco CallManager Express Integration with Cisco CallManager (Cont.) Cisco CallManager Express, CUE Cisco CallManager Distributed Cisco CallManager with CUE at small, remote locations Fat pipe QoS- enabled IP WAN PSTN Cisco CallManager Cisco CallManager Express, CUE Voice mail

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express Migration to Cisco CallManager/SRST Branch offices router can be migrated from a Cisco CallManager Express router to an SRST router in a Centralized Cisco CallManager Cluster Requires changes to configuration of the router Investment protection is built into Cisco CallManager Express license Allows for easy segmented migration plan

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express Migration to Cisco CallManager/SRST (Cont.) Networked Location A Applications (UM, IVR, ICD, etc.) Central Site Cisco CallManager Cluster – Central Call Processing Cisco CallManager Express, CUE – Localized Call Processing Fat pipe PSTN QoS- Enabled IP WAN CallManager Express SRST CallManager Express Phones Cisco CallManager Phones Cisco CallManager Express Phones CCM Phones

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions H.450-Compliant Networks Cisco CallManager Express A Cisco CallManager Express B IP WAN Step 1 - Call from 1000 to 2000 Step 2 - Transfer or forward to Step 3 – H.450. X message to Cisco CallManager Express A and Cisco CallManager Express C Cisco CallManager Express C Step 4 – Call is transferred or forwarded 1000 Step 5 – Cisco CallManager Express B is no longer involved with the call

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions Non-H.450-Compliant Networks Hairpinning mechanism can be used for non- H.450-compliant networks like Cisco CallManager, BTS, and PGS Hairpinning can be used to allow H.323 devices to interact with the CUE module Hairpinning can cause bandwidth consumption problems Tandem gateway can address the bandwidth consumption issues

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions Non-H.450-Compliant NetworksHairpinning Cisco CallManager Express A Cisco CallManager Express B IP WAN Step 1 - Call from 1000 to 2000 Step 2 - Transfer or forward to 3000 voice service voip allow-connections h323 to h Step 3 – Call is hairpinned and connected to 3000 Non-H.450 Gateway

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions H.323 to SIP IP WAN voice service voip allow-connections h323 to sip 3000 Step 1 – A H.323 call arrives to the CUE Auto Attendant pilot number SIP Gateway H.323 Skinny CUE Cisco CallManager Express Step 2 – A hairpin between the H.323 call leg and the SIP call leg to the CUE module is set up Step 3 – The SIP connection to the CUE module is setup

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Example: show voip rpt connections Detail #show voip rtp connections VoIP RTP active connections : No. CallId dstCallId LocalRTP RmtRTP LocalIP RemoteIP Found 2 active RTP connections show voip rtp connections CMERouter# View the current RTP connections Connection 1 Call Id maps to connection 2 Call Id as its destination Call Id

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions Non-H.450-Compliant NetworksTandem Gateway Cisco CallManager Express A Cisco CallManager Express B IP WAN Step 1 –Call made from 1000 to 2000 H.450 Tandem Gateway Step 2 -Transfer or forward from 2000 to Step 4 –Call is transferred or forwarded Step 5 –Local hairpin at Cisco CallManager site, not across WAN Step 3 –H or H message to tandem gateway and Cisco CallManager Express A

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions Non-H.450-Compliant Networks Trunk Configuration Gatekeeper controlled or non-gatekeeper controlled Media Termination Point Required must be selected Cisco CallManager Express will register with Cisco CallManager IP address of Cisco CallManager Express or tandem gateway MTP selected

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions Non-H.450-Compliant Networks (Cont.) Set Send H225 User Info message to H225 Info for Ringback Modify the service parameters of the Cisco CallManager service to the following settings Set H.323 Faststart Inbound to Falsethis is the default

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions H.323 Gatekeeper H.323 Gatekeeper Part of the H.323 standard Can be used with Cisco CallManager Express router Call Admission Control (CAC) functions Can be used for centralizing dial plan

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions H.323 Gatekeeper (Cont.) Pod1 Pod2 Pod3 Pod4 Pod5 Pod6 Pod7 Pod8 Gatekeeper pair running HSRP and GUP Recommended for 20+ sites WAN

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Cisco CallManager Express H.323 Interoperability Solutions Non-H.450-Compliant Networks gatekeeper zone local pod1 cisco.com zone local pod2 cisco.com zone local pod3 cisco.com zone local pod4 cisco.com zone local pod5 cisco.com zone local pod6 cisco.com zone local pod7 cisco.com zone local pod8 cisco.com zone prefix pod zone prefix pod zone prefix pod zone prefix pod zone prefix pod zone prefix pod zone prefix pod zone prefix pod gw-type-prefix 1#* default-technology bandwidth interzone default 128 no shutdown gateway … interface FastEthernet0/1 ip address H.323-gateway voip interface H.323-gateway voip id pod1 ipaddr H.323-gateway voip H.323-id gw1 H.323-gateway voip tech-prefix 1# H.323-gateway voip bind srcaddr ephone-dn number 1000 secondary no-reg primary Gatekeeper Cisco CallManager Express The E.164 number will register, the primary will not WAN

© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Summary The Cisco CallManager Express system can be configured in a fashion similar to a key switch, PBX, or a hybrid of both. The simplest deployment will have a single site with one Cisco CallManager Express router and up to 240 phones. Cisco CallManager Express communicates with CUE via the SIP protocol. Cisco CallManager Express can be integrated with Cisco CallManager. The Cisco CallManager Express system can be migrated to an SRST router with the migrating phones being under the control of Cisco CallManager. Cisco CallManager does not support H.450 protocols. When integrating with Cisco CallManager Express, this can be dealt with by hairpinning calls or a tandem gateway.