Kaustubh Inamdar, CCIE Voice No. 42277, is an escalation point for the Multiservice teams of the Cisco Unified Communications Technical Assistance Center (TAC) in India. He has worked on numerous complex VoIP issues for Cisco partners and key customers. He is a subject matter expert in the area of real-time communications and has deep knowledge of the associated standards and protocols. He is also the co-inventor of five patents (pending) in diverse areas such as collaboration, security, machine learning, and cloud technologies.Steve Holl, CCIE Collaboration No. 22739, manages a global engineering team that supports the Cisco Collaboration as a Service (CaaS) offering for Cisco’s largest customers. Joining Cisco in 2005, he previously served as a team lead for voice solutions in the Global Technical Assistance Center (TAC). Steve graduated from the Rochester Institute of Technology with a bachelor of science in Applied Networking and System Administration, and he later completed a master’s of engineering in Engineering Management at the University of Colorado Boulder. In addition to holding a CCIE since 2008, Steve is also an ITIL Expert, PMP, and Six Sigma Black Belt. In his spare time, he enjoys cooking with his wife, Jenn, playing loud guitar solos, and undertaking outdoor adventures.Gonzalo Salgueiro, CCIE No. 4541, is a Principal Engineer at Cisco, working on several emerging technologies and the services opportunities they offer. Gonzalo has spent more than 20 years at Cisco, establishing himself as a subject matter expert, an innovator, and an industry thought leader in various technologies, including Collaboration, ML/AI, Cloud, and IoT.Gonzalo is an established member of numerous industry organizations and is a regular presenter and distinguished speaker at a variety of technical industry conferences and Cisco events around the world. He currently holds various industry leadership roles, including serving as a member of the Board of Directors of the SIP Forum, co-chair of the INSIPID and SIPBRANDY IETF working groups, a member of the IoT Directorate in the IETF, and co-chair of the WebRTC Task Group, IPv6 Task Group, and FoIP Task Group in the SIP Forum. He is an active contributor to various industry organizations and standardization activities.Gonzalo previously co-authored the Cisco Press books IoT Fundamentals: Networking Technologies, Protocols, and Use Cases for the Internet of Things as well as Fax, Modem, and Text for IP Telephony. He has also co-authored 25 IETF RFCs, 4 IEEE papers, 4 ITU contributions, and numerous industry and academic research papers on a variety of different technical topics. He is also co-inventor of 100+ patents (issued and pending) and has contributed to various interop and open source development efforts. Gonzalo received a master’s degree in Physics from the University of Miami.Kyzer Davis, CCIE Collaboration No. 54735, is an escalation point for the worldwide Multiservice teams of the Cisco Technical Assistance Center (TAC). He is the focal point for supporting, troubleshooting, and resolving complex solution-level problems involving Voice, Video, and Cloud portions of the Cisco Unified Collaboration product portfolio.In addition to his work on this book, Kyzer has also authored numerous technical white papers on Cisco Collaboration configuration, architecture, and protocol design. In addition, he works with Learning@Cisco on strategy and content development for numerous Cisco certifications. Kyzer is a technology enthusiast and mentor who is always working on automation initiatives and dabbling with new and evolving technology in the lab. He also enjoys a mean barbecue.Chidambaram (Arun) Arunachalam, CCIE No. 14809, is a Cisco Principal Engineer, responsible for resolving complex problems in large-scale collaboration networks. He works closely with engineering teams to drive solution-level serviceability requirements for end-to-end call signaling analysis in contact center environments and with industry experts for defining end-to-end SIP message logging capabilities (logme). He co-leads the Collaboration focus area within the TAC Technology office and is currently working on innovations such as Faster Cisco Support Experience (direct connection to engineer) and TAC Virtual Spaces (Webex Teams as a real-time communication channel for support engagements). He is a contributor to Wireshark and guides NCSU graduate students in developing Wireshark dissectors. His areas of interest include ease of doing business, talent development, and innovation.

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• Foreword xxxIntroduction xxxiiiPart I IntroductionChapter 1 Laying the Groundwork 1Overview of SIP 3Overview of H.323 18Introduction to SIP Trunking 20Introduction to SDP 26Overview of B2BUAs 42Session Border Controllers 44Cisco Unified Border Element 53Summary 54References 54Chapter 2 SBC Deployment Models 55Purposeful Deployments 56CUBE Deployment Options 61Multi-VRF Support on CUBE 68SBC High Availability 72Summary 108References 109Part II Architecture, Capabilities and DesignChapter 3 Call Routing 111Dialing and Routing a SIP Call 112Call Routing Types 128Next-Hop Determination 132End-to-End Call Trace 141CUBE Call Routing Mechanisms 149Summary 221References 222Chapter 4 Signaling and Interworking 225SIP—SIP Interworking 226SIP Header Interworking 281SIP Normalization 283Transport and Protocol Interworking 299Supplementary Services 312SIP—H.323 Interworking 319Summary 323References 323Chapter 5 Media Processing 327Real-Time Transport Protocol 328Real-Time Transport Control Protocol 334SBC Handling of RTP and RTCP 341Symmetric and Asymmetric RTP/RTCP 354DSP-Based RTP Handling on SBCs 356Media Anti-Tromboning 374Alternative Network Address Types 378Solving NAT Traversal Challenges 380Troubleshooting RTP 404Summary 413References 413Chapter 6 Secure Signaling and Media 415Understanding Secure Technologies 415Establishing Secure Sessions 449SBC Signaling and Media Security 474Alternative Security Methods 504Summary 504References 505Chapter 7 DTMF Interworking 509Introduction to DTMF Relay 510Variants of DTMF Relay 512DTMF Relay on SBCs 530Configuring and Troubleshooting DTMF Relay 546Summary 568References 568Chapter 8 Scalability Considerations 571Platform Sizing 572Licensing 598Overload Prevention Techniques 610Summary 625References 626Part III Integrations and InteroperabilityChapter 9 SIP Trunking for PSTN Access Through SBCs 627Best Practices for ITSP Access with SBCs 628SIP Trunk Registration 635Authentication 642Registration with SBCs 648Troubleshooting 671Summary 677References 677Chapter 10 Fax over IP (FoIP) on SBCs 679Introduction to Fax 680Analyzing a Basic Fax Call 683Fax over IP (FoIP) 699SBC Handling of FoIP 721FoIP on CUBE 723Summary 750References 750Chapter 11 Network-Based Call Recording 751The Business Need for Call Recording 752IETF SIP Recording Architecture (SIPREC) 753SIPREC Configuration 763SIPREC Troubleshooting 775Cisco UC Gateway Services Architecture 789The XCC and XMF Data Model 792API-Based Recording 797API-Based Recording Configuration 811API-Based Recording Troubleshooting 823Summary 836References 836Chapter 12 Contact Center Integration 839Cisco UCCE Architecture 840Inbound Calls to Agents 847Call Transfers 885Courtesy Callback 902Call Progress Analysis (CPA) 914Troubleshooting Scenarios 931Summary 953References 953Part IV Security and OperationsChapter 13 Security Threat Mitigation 955An Overview of Security Threats to Collaboration Solutions 956Types of Security Threats 959Other SBC Security Features 998Designing Collaboration Networks for Security 1009Summary 1018References 1018Chapter 14 Monitoring and Management 1021Monitoring 1021Management 1050Summary 1069References 1070Appendix A Q.850 Release Cause Values 10739781587144769, TOC, 11/7/2018