About the Authors

Kyzer Davis, CCIE Collaboration No. 54735, is an escalation point for various worldwide cloud and collaboration teams within Cisco Systems. He is the focal point for supporting, troubleshooting, and resolving complex, solution-level problems involving voice, video, cloud, and security portions of the Cisco Unified collaboration product portfolio. In addition to his work on this book, Kyzer has authored and presented numerous technical white papers on Cisco collaboration configuration, architecture, protocol design, and security topics, many of which are leveraged by Cisco partners, Cisco exam instructors, and Cisco employees for training and education.

Prior to writing this book, Kyzer co-authored the Cisco Press publication Understanding Session Border Controllers: Comprehensive Guide to Designing, Deploying, Troubleshooting, and Maintaining Cisco Unified Border Element (CUBE) Solutions. 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 in new and evolving technology. He also enjoys a mean barbecue.

Paul Giralt, CCIE R&S, CCIE Voice, CCIE Collaboration No. 4793, is a distinguished engineer in the Customer Experience organization, where he focuses on Cisco collaboration technologies. He spends much of his time helping Cisco's largest customers accelerate the adoption of Cisco technologies and solutions and building new services capabilities to provide more proactive and predictive services as well as improve product serviceability. Paul has spent his 22+-year career at Cisco in TAC, the Collaboration Technology Group, Solution Validation Services, Cisco Advanced Services, and, most recently, as part of the Customer Experience organization. Paul has spent years troubleshooting and diagnosing issues on some of the largest and most complex Cisco collaboration deployments. He is passionate about the intersection of programmability and Cisco collaboration products as well as giving customers the knowledge and tools they need to diagnose issues on their own.

Paul is the author of the classic Cisco Press title Troubleshooting Cisco IP Telephony and is well known for his Cisco Live! sessions on SIP, collaboration APIs, troubleshooting Cisco collaboration, and other topics related to Cisco collaboration, making him a member of the Cisco Live! Distinguished Speaker Hall of Fame Elite. He is also the creator of the TranslatorX tool, which is used across the Cisco collaboration industry, as well as a contributor to SIP standards in the IETF. Paul has a degree in computer engineering from the University of Miami.

Patrick Kinane, CCIE Collaboration No. 58284, is a senior engineer and escalation point for the worldwide Cisco Unified Communications Manager teams within Cisco Technical Assistance Center (TAC). He is a subject matter expert (SME) for Cisco collaboration products such as Cisco Unified Communications Manager, Cisco collaboration endpoints, Cisco Paging Server, and Cisco Emergency Responder. Patrick can be found on the following social media sites:

YouTube: https://www.youtube.com/patrick_kinane1

Twitter: https://twitter.com/patrick__k9

LinkedIn: https://www.linkedin.com/in/patrickkinane/

Gonzalo Salgueiro, CCIE No. 4541, is a distinguished engineer at Cisco working in the Customer Experience Technology Office (CXTO) helping to shape technical and organizational strategies, leading innovation and automation initiatives, and driving engineering excellence. Gonzalo has spent 23+ years at Cisco, establishing himself as a subject matter expert, an innovator, and an industry thought leader in various technologies, including collaboration, 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 has held various industry leadership roles, including serving as a member of the board of directors of the SIP Forum, co-chair of the ASAP, 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 three Cisco Press books on IoT and collaboration technologies. 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 120+ 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.

About the Technical Reviewers

Esteban Valverde, CCIE No. 34305, is a Cisco technical leader with 14 years of experience in networking and software development. In his current role, he is part of the Cisco collaboration team of the Technical Assistance Center (TAC) in Research Triangle Park, North Carolina. His main focus is working with customers and Cisco support engineers on escalations that involve Cisco Unified Border Element (CUBE), fax and modems, Cisco Unified Communications Manager, and Unified Contact Center Enterprise Deployments, as well as working closely with the Cisco Engineering team to enhance product serviceability and automating common troubleshooting tasks. During the past years, he has specialized in troubleshooting complex issues for some of the largest VoIP networks and has provided technical leadership for some of the most critical worldwide collaboration deployments. Esteban has developed and delivered all levels of training and documentation on the Cisco Unified Border Element to Cisco technical teams. He holds a bachelor’s degree in systems engineering.

Michael Mendoza, CCIE No. 34300, is based in Cisco's Research Triangle Park, North Carolina, office. He has worked on Unified Collaboration technologies for 12 years as part of the Multiservice (MS) and the Unified Communication Manager Technical Assistance Center (TAC) teams. In his current role as a technical leader within TAC, he is responsible for an escalation point as well as a point of contact for any technical support topics between TAC and the Cisco engineering team for multiple unified collaboration products. Michael's areas of expertise include Cisco Unified Communications Manager, endpoints, Cisco Emergency Responder, voice gateways, Cisco Unified Border Element (CUBE), and more. Michael is a seasoned Cisco Live! speaker and is heavily involved in automation, software development, and innovation projects; he is always striving to find new ways to make the lives of TAC engineers supporting Cisco customers globally easier.