1. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-1 Understanding the Role of Telephony Components in Cisco Unity Design Cisco Unity Design Process—Presales

2. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-2 Cisco Unified CallManager Publisher Cluster 2 Cisco Unified CallManager Subscriber Cisco Unity Server Cisco Unified CallManager Publisher Cisco Unified CallManager Subscriber Cluster 1 What Is the Role of Cisco Unified CallManager (IP) in a Cisco Unity Design? One Cisco Unity server can service multiple Cisco Unified CallManager clusters. The Cisco Unity server can be located away from the Cisco Unified CallManager system as long as bandwidth recommendations are followed. Cisco Unity can be configured in a dual-integration mode and service both Cisco Unified CallManager and a circuit-switched PBX.

3. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-3 Exchange 2000 Cisco Unity DC GC DDNS WAN The Role of a Circuit-Switched PBX Using DTMF Integration in the Cisco Unity Design Location is an issue. Cisco Unity must be collocated with the circuit-switched PBX using DTMF integration. Check the appropriate integration guide.

4. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-4 The Role of a Circuit-Switched PBX Using Serial of PBXlink in the Unity Design Importance of location in design with circuit-switched PBX using serial or PBXlink integration: Physical location important Physical cable required between Cisco Unity and the PBX Check the appropriate integration guide

5. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-5 Cisco SIP Proxy Server Cisco Unity WAN Physical location not an issue for IP connectivity as long as bandwidth recommendations are followed. What Is the Role of Cisco SIP Proxy Server in a Cisco Unity Design?

6. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-6 Cisco Unity1 Exchange 2000 WAN DC GC DDNS What Is the Role of Cisco Unity PIMG in a Cisco Unity Design? The Cisco Unity PIMG unit interprets the PBX digital telephone call and integration information into SIP to Cisco Unity. Physical location not an issue for IP connectivity as long as bandwidth recommendations are followed.

7. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-7 Exchange 2000 Cisco Unity1 DC GC DDNS WAN The Cisco Unity PIMG unit interprets the PBX digital telephone call and integration information into SIP for Cisco Unity. Physical location not an issue for IP connectivity as long as bandwidth recommendations are followed. What Is the Role of a Remote Cisco Unity PIMG in a Cisco Unity Design?

8. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-8 Router/ Gateway PSTN Gateway or Router QoS-Enabled WAN Infrastructure Call Processing IP Phones or Endpoints Voice Messaging and Applications Cisco Unified CallManager Voice Mail and Unified Messaging DSP DSP Resources for Conferencing Voice-Enabled Gateway IP WAN PSTN

9. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-9 What Role Does QoS Play in a Cisco Unity Design? QoS issues in a VoIP network Several factors can degrade voice quality in a packet-switched voice network: Packet loss Excessive delay Excessive jitter

10. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-10 Summary Cisco Unity must communicate with a phone switch. IP phone switches, usually Cisco Unified CallManager systems, do not require a physical connection to Cisco Unity; topology issues must be accounted for. Circuit-switched analog and digital PBXs and key systems require a physical connection to Cisco Unity, unless the Cisco Unity PIMG integration method is used, which then allows the flexibility of a SIP-based integration. Cisco Unity design engineers are required to have an understanding of auxiliary components of the Cisco Unity server and how they interact with the Cisco Unity application.

11. © 2006 Cisco Systems, Inc. All rights reserved. CUDN v1.1—1-11