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  • Cisco Unified Communications Manager Session Management Edition, Release 8.6(1) Version 8.6(1)

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    Text Part Number: OL-25265-01

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  • Cisco OL-25265-01

    C O N T E N T S

    Preface v

    Overview 1-1

    Unified CM Session Management Edition Basics 1-1 When to Deploy Unified CM Session Management Edition 1-2 Differences Between Unified CM Session Management Edition and Standard Cisco Unified CM Clusters 1-3

    Architecture Overview 1-4 SIP Trunks 1-4

    SIP Trunks for IP PSTN Connectivity 1-5 H.323 Intercluster Trunks 1-5 H.323 Gateways 1-6 MGCP Gateways 1-6 Features New to Cisco Unified CM Release 8.5(1) 1-6

    Trunk Type and Feature Recommendations for Multi-Cluster Deployments 1-7 Multiple Clusters That Run Cisco Unified CM 8.5 1-7 Multiple Clusters That Run Cisco Unified CM 8.5 and Pre-8.5 Versions 1-8

    Unified CM Session Management Edition Components 1-10 Unified CM Session Management Edition Clusters 1-10 Unified CM Leaf Clusters 1-11 Third Party Leaf Cisco Unified CM Systems 1-11 IP PSTN Connectivity 1-11

    Centralized Applications 1-11

    Before you Begin 1-12 Licensing 1-12 Interoperability Testing 1-12 Installation Considerations 1-13 Unified CM Session Management Edition Design Considerations 1-13

    Cisco Unified Communications Manager Trunks 2-1

    A Comparison of SIP and H.323 Trunks 2-1

    SIP Trunks Overview 2-4 General Deployment Considerations 2-5 SIP Trunk Features and Operation 2-5

    SIP Trunks Can Run on All Active Unified CM Nodes 2-5

    i Unified Communications Manager Session Management Edition, Release 8.6(1)

  • Contents

    Up to 16 SIP Trunk Destination IP Addresses 2-5 SIP OPTIONS Ping 2-6 SIP Early Offer Support over Cisco Unified CM SIP Trunks 2-6 QSIG over SIP Trunks 2-9 SIP Trunk Message Normalization and Transparency 2-9 Route Lists Run on All Active Unified CM Nodes 2-13 SIP Trunks Using DNS 2-14

    High Availability for SIP Trunks 2-16 Multiple Source Cisco Unified CM Servers for Originating SIP Trunk Calls 2-16 Multiple Destination IP Addresses per SIP Trunk 2-17 Design Considerations When Using Run on All Active Unified CM Nodes 2-17 Multiple SIP Trunks Using Route Lists and Route Groups 2-17 SIP OPTIONS Ping 2-17

    Load Balancing for SIP Trunks 2-17 Outbound Calls over a Single SIP Trunk 2-18 Outbound Calls over Multiple SIP Trunks 2-18 SIP OPTIONS Ping 2-18

    SIP Delayed Offer and Early Offer 2-18 Media Termination Points 2-19 DTMF Transport 2-21 SIP Trunk Transport Protocols 2-22 Secure SIP Trunks 2-22

    Media Encryption 2-22 Signaling Encryption 2-22

    Calling Party Number Transformation and SIP Trunks 2-23 SIP Trunk Service Types 2-24 Design Considerations for SIP Trunks 2-25

    Considerations for SIP Intercluster Trunks 2-25 Using Standard Cisco Unified CM Groups with SIP Intercluster Trunks 2-25 Using Run on All Active Unified CM Nodes with SIP Intercluster Trunks 2-26 Using Standard Cisco Unified CM Groups and Run on All Active Unified CM Nodes with SIP Intercluster Trunks 2-27

    Trunk Type and Feature Recommendations for Multi-Cluster Deployments 2-28 Multiple Clusters All Running Cisco Unified CM 8.5 or Later Releases 2-29 Multiple Clusters Running Cisco Unified CM 8.5 and Prior Releases 2-30

    Trunk Design Considerations for Clustering over the WAN 2-31 Design Guidance for Clustering over the WAN with Leaf Cluster Trunks 2-32 Design Guidance for Clustering over the WAN with Unified CM Session Management Edition Cluster Trunks 2-33

    Other SIP Trunk Deployment Considerations 2-33

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  • Contents

    H.323 Trunks Overview 2-34 General H.323 Intercluster Trunk Deployment Considerations 2-34 Basic Operation of H.323 Trunks 2-35 H.323 Trunk Types 2-35

    Intercluster Trunk (Non-Gatekeeper Controlled) 2-35 Intercluster Trunk (Gatekeeper Controlled) 2-42 H.225 Trunk (Gatekeeper Controlled) 2-43 High Availability for Gatekeeper Controlled Trunks 2-43 Load Balancing Outbound Calls over H.323 Gatekeeper Controlled Trunks 2-46 H.323 Outbound FastStart Call Connections 2-47 H.323 Trunks with Media Termination Points 2-48 DTMF Transport 2-48 H.323 Trunk Transport Protocols 2-48 Secure H.323 Trunks 2-48

    H.323 Operation in Cisco Unified CM 2-49 Other Design Considerations for H.323 Trunks 2-53

    General SIP and H.323 Trunk Design Considerations 2-53 Deterministic Outbound Call Load Balancing over Cisco Unified CM Trunks 2-53 Codec Selection Over IP Trunks 2-54 Other MTP Uses 2-55

    Other Design Considerations for Unified CM Session Management Edition Deployments 2-55 Unified CM Session Management Edition and SAF CCD Deployments 2-56 Advertising SAF CCD Routes to Leaf Clusters from/through Unified CM Session Management Edition 2-56 Advertising SAF CCD Routes from Leaf Clusters to Unified CM Session Management Edition 2-56 Operational Considerations for Unified CM Session Management Edition and SAF CCD Deployments 2-58 Cisco Unified CM Trunks and Emergency Services 2-59 Capacity Planning for Cisco Unified CM IP Trunks 2-59 IP PSTN and IP Trunks to Service Provider Networks 2-60 Cisco Unified Border Element 2-60

    Protocol and Media Interworking 2-60 Service Provider SIP Trunk Best Practice Recommendations 2-61 Design Considerations for Scalability and Redundancy 2-61 Security Best Practices 2-62 Management and Monitoring of Service Provider SIP Trunks 2-63

    Trunk IP-PSTN Connection Models 2-63

    Deployment Examples A-1

    iii Cisco Unified Communications Manager Session Management Edition, Release 8.6(1)

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  • Contents

    iv Cisco Unified Communications Manager Session Management Edition, Release 8.6(1)

    OL-25265-01

  • Preface

    This preface describes the purpose, audience, organization, and conventions of this guide and provides information on how to obtain related documentation.

    Note This document may not represent the latest Cisco product information available. You can obtain the most current documentation by accessing Cisco's product documentation page at this URL: http://www.cisco.com/en/US/products/sw/voicesw/ps556/tsd_products_support_series_home.html

    The preface covers these topics:

    • Purpose, page v

    • Audience, page v

    • Organization, page vi

    • Related Documentat