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Understanding Session Border Controllers: Comprehensive Guide to Deploying and Maintaining Cisco Unified Border Element Solutions [Mīkstie vāki]

  • Formāts: Paperback / softback, 1200 pages, height x width x depth: 231x188x58 mm, weight: 1820 g
  • Sērija : Networking Technology
  • Izdošanas datums: 17-Jan-2019
  • Izdevniecība: Cisco Press
  • ISBN-10: 158714476X
  • ISBN-13: 9781587144769
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  • Formāts: Paperback / softback, 1200 pages, height x width x depth: 231x188x58 mm, weight: 1820 g
  • Sērija : Networking Technology
  • Izdošanas datums: 17-Jan-2019
  • Izdevniecība: Cisco Press
  • ISBN-10: 158714476X
  • ISBN-13: 9781587144769
Citas grāmatas par šo tēmu:
The complete guide to deploying and operating SBC solutions, Including Cisco Unified Border Element (CUBE)

Enterprise and service provider networks are increasingly adopting SIP as the guiding protocol for session management, and require leveraging Session Border Controller (SBC) technology to enable this transition. Thousands of organizations have made the Cisco Unified Border Element (CUBE) their SBC technology of choice.

Understanding Session Border Controllers gives network professionals and consultants a comprehensive guide to SBC theory, design, deployment, operation, security, troubleshooting, and more. Using CUBE-based examples, the authors offer insights that will be valuable to technical professionals using any SBC solution.

The authors thoroughly cover native call control protocols, SBC behavior, and SBCs benefits for topology abstraction, demarcation and security, media, and protocol interworking. They also present practical techniques and configurations for achieving interoperability with a wide variety of collaboration products and solutions.





Evaluate key benefits of SBC solutions for security, management, and interoperability Master core concepts of SIP, H.323, DTMF, signaling interoperability, call routing, fax/modem over IP, security, media handling, and media/signal forking in the SBC context Compare SBC deployment scenarios, and optimize deployment for your environment Size and scale an SBC platform for your environment, prevent oversubscription of finite resources, and control cost through careful licensing Use SBCs as a back-to-back user agent (B2BUA) to interoperate between asymmetric VoIP networks Establish SIP trunking for PSTN access via SBCs Interoperate with call servers, proxies, fax servers, ITSPs, redirect servers, call recording servers, contact centers, and other devices Secure real-time communications over IP Mitigate security threats associated with complex SIP deployments Efficiently monitor and manage an SBC environment
Foreword xxx
Introduction xxxiii
Part I: Introduction
Chapter 1 Laying the Groundwork
1(54)
Overview of SIP
3(15)
Brief Introduction to and History of SIP
3(1)
Operation
3(3)
SIP Messages
6(1)
Breaking Down a SIP Call
7(1)
Forming a Request
8(3)
Forming a Response
11(4)
Analyzing a Basic SIP Call
15(3)
Overview of H.323
18(2)
H.323 Components
18(1)
H.323 Call Flow
19(1)
Introduction to SIP Trunking
20(6)
SIP Trunking Architectural Models
23(3)
Introduction to SDP
26(16)
The Offer/Answer Framework
30(1)
Operation of the Offer/Answer Framework
31(1)
Generating the SDP Offer and Answer
31(6)
Modifying a Session
37(2)
Adding a Media Stream
39(2)
Removing a Media Stream
41(1)
Modifying the Address, Port, Transport or Media Format
42(1)
Overview of B2BUAs
42(2)
Session Border Controllers
44(9)
SBCs versus Proxies
46(3)
Common SBC Functions
49(1)
Topology Abstraction
49(1)
NAT Traversal
50(1)
DoS and Overload Protection
50(1)
Fixing Capability Mismatches
51(2)
Cisco Unified Border Element
53(1)
Summary
54(1)
References
54(1)
Chapter 2 SBC Deployment Models
55(56)
Purposeful Deployments
56(5)
External Integrations
57(1)
Integrating for PSTN Access
57(1)
Integrations with Mergers and Acquisitions
57(1)
Internal Integrations
58(1)
Integrating with Third-Party Appliances
58(1)
Contact Center Integration
58(1)
Call Recording Integration
59(1)
Line-Side Integrations
60(1)
CUBE Deployment Options
61(7)
Supported Platforms
62(1)
Hardware Appliance versus Virtualization
63(2)
Platform Feature Comparison
65(1)
IOS versus IOS XE
66(2)
Planning for Media Resources
68(1)
Multi-VRF Support on CUBE
68(4)
Multi-VRF Configuration
70(2)
SBC High Availability
72(36)
Checkpointing for Stateful Failover
76(1)
Intra-box redundancy
77(1)
Types of Failover
77(1)
Synchronization for SSO
78(1)
Intra-Box Redundancy Options for ASR Platforms
79(1)
Configuration of RPR or SSO
80(1)
Troubleshooting Redundancy
80(3)
Inter-Box Redundancy
83(1)
CUBE High Availability with HSRP
83(13)
CUBE High Availability with Redundancy Groups
96(9)
External Resiliency
105(1)
External Peer Resilience with CUBE with Multiple Trunks
105(3)
Summary
108(1)
References
109(2)
Part II Architecture, Capabilities and Design
Chapter 3 Call Routing
111(114)
Dialing and Routing a SIP Call
112(16)
SIP INVITE Request Forwarding
114(1)
SIP INVITE Response Routing
115(6)
SIP Record-Route and Route Header Fields
121(7)
Call Routing Types
128(4)
Directory Number-Based Routing
129(1)
URI-Based Routing
130(1)
Source-Based Routing
130(1)
Trunk Group-Based Routing
131(1)
Carrier-Based Routing
132(1)
Next-Hop Determination
132(4)
IP Address
133(1)
Host Name
133(1)
DNS SRV
134(2)
Next-Hop Availability Check
136(5)
SIP OPTIONS Ping
138(3)
End-to-End Call Trace
141(8)
Session-ID
143(1)
Local and Remote UUID
143(6)
CUBE Call Routing Mechanisms
149(72)
Dial Peers
150(1)
Inbound and Outbound Dial Peers
150(8)
Inbound Dial Peer Matching Rules
158(4)
Outbound Dial Peer Matching Rules
162(4)
Translation Profiles
166(1)
Called Number Transformation
167(3)
Calling Number Transformation
170(2)
Redirect Number Transformation
172(3)
Call Blocking
175(1)
Dial Peer Optimization
176(2)
E.164 Pattern Map
178(2)
Server Group
180(4)
URI-Based Dialing
184(3)
Call Routing in Multitenant Environments
187(6)
Dial Peer Groups (DPGs)
193(5)
Dial Peer Provisioning Policies
198(4)
Call Rerouting
202(1)
Rerouting Criteria
202(1)
Reroute Mechanisms
203(5)
Troubleshooting Call Setup Failures
208(6)
Troubleshooting Tools
214(6)
Common Call Setup Failure Reasons
220(1)
Summary
221(1)
References
222(3)
Chapter 4 Signaling and Interworking
225(102)
SIP-SIP Interworking
226(55)
Early Offer and Delayed Offer Interworking
226(2)
Reliable Handling and Interworking of Provisional Responses
228(5)
Ringback and Provisional Response Interworking
233(6)
Signal Forking
239(5)
Mid-call Signaling
244(1)
Hold/Resume
244(8)
Music-on-Hold
252(2)
Call Transfer
254(13)
UPDATE
267(4)
Session Refresh
271(7)
Managing Mid-call Signaling
278(3)
SIP Header Interworking
281(2)
SIP Normalization
283(16)
SIP Profile Configuration
284(3)
Outbound SIP Profiles
287(4)
Inbound SIP Profiles
291(2)
SIP Copylist
293(2)
Common SIP Profiles
295(3)
Troubleshooting SIP Profiles
298(1)
Transport and Protocol Interworking
299(13)
Layer 4 Transport Interworking
300(6)
Layer 3 IP Interworking
306(6)
Interworking Protocol Extensions
312(1)
Supplementary Services
312(7)
Call Forwarding
313(1)
Message Waiting Indicator (MWI)
314(3)
Joins/Replaces
317(2)
SIP-H.323 Interworking
319(4)
Troubleshooting SIP-H.323 Interworking
322(1)
Summary
323(1)
References
323(4)
Chapter 5 Media Processing
327(88)
Real-Time Transport Protocol
328(6)
RTP Packet Format
329(5)
RTP Enhancements
334(1)
Real-Time Transport Control Protocol
334(7)
RTCP Packet Types
335(1)
RTCP Sender Report (SR)
336(1)
RTCP Receiver Report (RR)
337(2)
RTCP Source Description (SDES) Packet
339(1)
RTCP Goodbye Packet (BYE)
340(1)
RTCP APP Packet (APP)
341(1)
SBC Handling of RTP and RTCP
341(13)
Media Flow-Around
346(1)
Media Flow-Through
347(1)
Configuration for Media Handling
348(5)
Generic RTP and RTCP Handling by SBCs
353(1)
Assisted RTCP on SBCs
353(1)
Configuration of Assisted RTCP
354(1)
Symmetric and Asymmetric RTP/RTCP
354(2)
DSP-Based RTP Handling on SBCs
356(18)
Overview of DSPs on SBCs
356(1)
Transcoding
357(1)
Skinny Client Control Protocol (SCCP) Transcoder
358(8)
Local Transcoding Interface (LTI) Transcoder
366(2)
Transrating
368(4)
Transrating on CUBE
372(2)
Media Anti-Tromboning
374(4)
Alternative Network Address Types
378(2)
Solving NAT Traversal Challenges
380(24)
How NAT Works
380(3)
Problems with Real-Time Collaboration over NAT
383(1)
ALG Fixup
383(2)
Limitations of ALG for NAT Fixup
385(1)
STUN
385(3)
Limitations of STUN
388(1)
TURN
388(5)
Limitations of TURN
393(1)
ICE
393(8)
ICE-Lite
401(3)
Troubleshooting RTP
404(9)
Summary
413(1)
References
413(2)
Chapter 6 Secure Signaling and Media
415(94)
Understanding Secure Technologies
415(34)
Encryption and Decryption
417(1)
Symmetric and Asymmetric Keys
418(1)
Block and Stream Ciphers
419(1)
Data Integrity Verification
419(3)
Public Key Cryptography
422(1)
Key Agreement
423(2)
Public Key Encryption
425(1)
Digital Certificates
426(7)
Secure Sockets Layer (SSL) and Transport Layer Security (TLS)
433(10)
Datagram Transport Layer Security (DTLS)
443(2)
Secure/Multipurpose Internet Mail Extensions (S/MIME)
445(4)
Establishing Secure Sessions
449(25)
Secure Signaling
450(2)
Secure Media
452(7)
Secure Media Key Management Protocols
459(1)
SDP Security (SDES)
460(4)
DTLS-SRTP
464(5)
Zimmermann RTP (ZRTP)
469(5)
SBC Signaling and Media Security
474(30)
SBC Signaling Plane Security
475(12)
SBC Media Plane Security
487(3)
Best-Effort SRTP and SRTP Fallback
490(2)
Hardening SBC Security
492(4)
Troubleshooting Signaling and Media Security
496(8)
Alternative Security Methods
504(1)
Summary
504(1)
References
505(4)
Chapter 7 DTMF Interworking
509(62)
Introduction to DTMF Relay
510(2)
Variants of DTMF Relay
512(18)
In-Band DTMF Relay
512(1)
Named Telephony Events
513(3)
Raw In-Band Tones
516(1)
Out-of-Band DTMF Relay
517(1)
SIP INFO
518(2)
SIP KPML
520(7)
SIP Notify
527(3)
H.245 Alphanumeric and Signal
530(1)
DTMF Relay on SBCs
530(16)
In-Band DTMF Relay on SBCs
531(1)
Named Telephony Events on SBCs
531(11)
Raw In-Band DTMF on SBCs
542(1)
Out-of-Band DTMF Relay on SBCs
543(3)
Configuring and Troubleshooting DTMF Relay
546(22)
Configuring and Troubleshooting Named Telephony Events
548(1)
Configuring Named Telephony Events
548(1)
Troubleshooting Named Telephony Events
549(9)
Configuring and Troubleshooting Raw In-Band DTMF
558(1)
Configuring Raw In-Band DTMF
558(2)
Troubleshooting Raw In-Band DTMF
560(5)
Configuring and Troubleshooting SIP KPML, SIP NOTIFY, and SIP INFO
565(1)
Configuring SIP KPML, SIP NOTIFY, and SIP INFO
565(1)
Troubleshooting SIP KPML, SIP NOTIFY, and SIP INFO
565(1)
Configuring and Troubleshooting H.245 Alphanumeric and H.245 Signal
566(1)
Configuring H.245 Alphanumeric/Signal
566(1)
Troubleshooting H.245 Alphanumeric and H.245 Signal
566(2)
Summary
568(1)
References
568(3)
Chapter 8 Scalability Considerations
571(56)
Platform Sizing
572(26)
General Scalability Concepts
572(1)
Calls per Second and Messages per Second
572(5)
Concurrent Calls
577(1)
Call Traffic Engineering
578(2)
Case Study: Sizing a Generic SBC
580(2)
CUBE Sizing
582(1)
General CUBE Platform Sizing
582(1)
Media Resource Sizing for CUBE
582(4)
Troubleshooting Scalability Issues
586(1)
CPU Utilization and System Load
586(5)
Memory Utilization
591(3)
Media Resource Capacity
594(4)
Licensing
598(12)
General Licensing Considerations
599(2)
CUBE Licensing Models
601(1)
UC Feature Set Licensing
602(5)
CUBE Licenses
607(3)
Overload Prevention Techniques
610(15)
SIP Overload Specifications
611(1)
RFC 7339: Overload Control Communication Scheme
612(2)
Overload Security Considerations
614(1)
Additional Overload Challenges
614(1)
Call Admission Control
615(1)
CAC on CUBE
616(9)
Summary
625(1)
References
626(1)
Part III Integrations and Interoperability
Chapter 9 SIP Trunking for PSTN Access Through SBCs
627(52)
Best Practices for ITSP Access with SBCs
628(7)
Security
628(1)
Dynamic Blacklisting
629(1)
Secure Signaling and Media
630(1)
Topology Abstraction
630(1)
Availability
630(1)
Overload Control
630(2)
Plurality of Entry and Exit Trunks
632(1)
SBC High Availability
633(1)
Monitoring
634(1)
Scalability
635(1)
SIP Trunk Registration
635(7)
Overview of RFC 3261 for SIP REGISTER
635(1)
Discovering a Registrar Server and Constructing a Request
636(1)
Refreshing Registrations
637(1)
Service Provider Peering and Registration
638(1)
Registration Mode
638(3)
Peering Mode
641(1)
Authentication
642(6)
Digest Authentication in SIP
643(1)
User Agent Authentication
644(3)
Proxy Authentication
647(1)
Digest Authentication Considerations
648(1)
Registration with SBCs
648(23)
Trunk-Side Registration
649(2)
Single Registrar
651(6)
Redundancy
657(3)
Multi tenancy
660(4)
Line-Side Registration
664(1)
Peer-to-Peer (P2P) Mode
665(1)
End-to-End (E2E) Mode
666(1)
Overload Protection and Registration Rate Limiting
667(2)
Configuring Line-Side Registration
669(2)
Troubleshooting
671(6)
SIP Trunk Not Registering with Service Provider
671(6)
Summary
677(1)
References
677(2)
Chapter 10 Fax over IP (FoIP) on SBCs
679(72)
Introduction to Fax
680(3)
Fax Group Classification
680(1)
Phases of a Fax Call
681(2)
Analyzing a Basic Fax Call
683(16)
T.30 Messages
686(1)
DIS, CSI, and NSF
686(2)
DCS, TSI, and NSS
688(1)
TCF, CFR, and FTT
689(1)
EOP, MCF, MPS, RTP, RTN, and DCN
690(1)
Error Correction Mode
691(5)
Super G3 (SG3) Faxing
696(2)
Important Fax Timers
698(1)
Fax over IP (FoIP)
699(22)
Switchover of Voice Calls to Fax
700(1)
Fax Passthrough
701(2)
Fax Passthrough over H.323
703(1)
Fax Passthrough over SIP
704(3)
Fax Relay
707(7)
Fax Relay over H.323
714(1)
Fax Relay over SIP
715(6)
SBC Handling of FoIP
721(2)
Uniform Fax Handling
721(1)
QoS Implementation
722(1)
Protocol Mismatch Handling
723(1)
FoIP on CUBE
723(27)
Fax Passthrough on CUBE
724(1)
Fax Passthrough over H.323
724(2)
Fax Passthrough over SIP
726(2)
Configuration of Fax Passthrough
728(2)
Troubleshooting Fax Passthrough on CUBE
730(5)
SG3 Faxing and Protocol Interworking
735(1)
Fax Relay on CUBE
736(1)
Fax Relay over H.323
736(1)
Fax Relay over SIP
737(5)
Fax Relay Fallback to Passthrough
742(1)
SG3 over Relay and Protocol Interoperability
743(1)
Configuration of Fax Relay on CUBE
744(1)
Troubleshooting Fax Relay on CUBE
745(4)
ECM, NSF, and SG3 Considerations
749(1)
Summary
750(1)
References
750(1)
Chapter 11 Network-Based Call Recording
751(88)
The Business Need for Call Recording
752(1)
Service Delivery Improvement
752(1)
Regulatory Compliance
753(1)
IETF SIP Recording Architecture (SIPREC)
753(10)
SIPREC Terminology
753(1)
Communication Session
754(1)
Session Recording Client
754(1)
Session Recording Server
754(1)
Media Forking
754(1)
Recording Session
755(1)
Recording Metadata
755(5)
Recording Session Establishment
760(3)
SIPREC Configuration
763(12)
Inbound, Outbound, and Recording Dial Peers
763(1)
Anchor Legs
764(1)
Media Recording Profiles
764(1)
Media Class
764(1)
Audio-Only Recording
764(3)
Video Recording
767(3)
Verification
770(5)
SIPREC Troubleshooting
775(14)
Recording Initiation Failures
786(2)
Missing Recording Metadata
788(1)
Missing Recording File
788(1)
Cisco UC Gateway Services Architecture
789(3)
Extended Call Control Provider
791(1)
Extended Media Forking Provider
791(1)
Extended Call Detail Record Provider
792(1)
Extended Serviceability Provider
792(1)
The XCC and XMF Data Model
792(5)
The XCC Call Control Model
792(1)
XCC Call Connection States
793(1)
XCC Media Event Filter
794(2)
XMF Media Forking
796(1)
API-Based Recording
797(14)
The Registration Process
798(4)
The Subscription Process
802(1)
The Media Forking Process
803(8)
API-Based Recording Configuration
811(12)
HTTP Server and Client Parameters
811(1)
UC Web Services API Parameters
812(1)
CUCM Network-Based Recording
812(1)
CUBE Configuration
813(1)
CUCM Configuration
814(5)
MediaSense Configuration
819(1)
Verifying the Configuration
820(3)
API-Based Recording Troubleshooting
823(13)
XMF Application Registration Issues
832(3)
Recording Not Being Initiated
835(1)
Summary
836(1)
References
836(3)
Chapter 12 Contact Center Integration
839(116)
Cisco UCCE Architecture
840(7)
UCCE Components
840(1)
Cisco Unified Border Element (CUBE)
841(1)
Cisco Unified SIP Proxy (CUSP)
842(1)
Voice Browsers
842(1)
Cisco Unified Customer Voice Portal (CVP)
843(1)
Cisco Unified Contact Center Enterprise (UCCE)
844(1)
Cisco Unified Communication Manager (CUCM)
845(1)
Cisco Agent Desktop (CAD)
846(1)
Cisco Finesse Agent Desktop
847(1)
Inbound Calls to Agents
847(38)
Deployment Scenario
848(1)
Solution-level Configuration
849(1)
UCCE Configuration
849(5)
CVP Configuration
854(2)
CUBE Configuration
856(3)
Cisco IOS VXML Gateway Configuration
859(5)
Cisco VVB Configuration
864(1)
CUCM Configuration
865(1)
Call Flow
865(1)
Caller Placed in Queue
866(8)
Caller Hears Ringback Tone
874(4)
Caller Connected to Agent
878(7)
Call Transfers
885(17)
SIP INVITE-Based Call Transfer
886(8)
SIP REFER-Based Call Transfer
894(8)
Courtesy Callback
902(12)
Deployment and Configuration
902(1)
Call Flow
903(11)
Call Progress Analysis (CPA)
914(17)
Deployment and Configuration
916(4)
Outbound Dialer Call Flow
920(9)
Troubleshooting: Answering Machine Not Detected
929(2)
Troubleshooting Scenarios
931(22)
Troubleshooting Intermittent Call Disconnects
933(16)
Survivability: Why Did It Happen?
949(4)
Summary
953(1)
References
953(2)
Part IV Security and Operations
Chapter 13 Security Threat Mitigation
955(66)
An Overview of Security Threats to Collaboration Solutions
956(3)
What Is the Target of an Attack?
957(1)
Where Do Attacks Originate?
958(1)
What Are the Targets of Attacks?
959(1)
Types of Security Threats
959(39)
Social Engineering and Impersonation
959(1)
Mitigating Social Engineering and Impersonation
960(1)
Caller ID Impersonation
961(3)
Mitigating Caller ID Impersonation
964(8)
Man-in-the-Middle Attacks
972(1)
Eavesdropping
973(7)
Signaling Hijacking
980(4)
Toll-Fraud Attacks
984(2)
Mitigating Toll-Fraud Attacks
986(3)
Telephony DoS
989(1)
Mitigating Telephony DoS Attacks
990(4)
Protocol Fuzzing
994(2)
Mitigating Protocol Fuzzing
996(1)
Brute-Force Attacks
997(1)
Mitigating Brute-Force Attacks
997(1)
Other SBC Security Features
998(11)
Co-Resident Firewall
998(3)
Address Hiding (Topology Abstraction)
1001(1)
Address Hiding on CUBE
1002(4)
Modifying and Disabling TCP/UDP Port Behavior
1006(1)
Media Source Port Validation
1007(1)
Cisco LOS and LOS XE Hardening
1008(1)
General Server Hardening
1009(1)
Designing Collaboration Networks for Security
1009(9)
Vulnerability and Risk Management
1010(1)
Access Control
1011(1)
Knowledge Management
1011(1)
Security Monitoring
1012(1)
Considerations for Integration Design
1012(1)
Local Peering Within the Trusted Network
1013(1)
Private Circuit Peering
1013(2)
Encrypted Peering over Public Circuits
1015(1)
Peering over Public Circuits
1016(1)
Network Security Mitigations External to the SBC
1017(1)
Summary
1018(1)
References
1018(3)
Chapter 14 Monitoring and Management
1021(52)
Monitoring
1021(29)
Monitoring Protocols
1023(1)
Push-Based Mechanisms
1023(1)
Poll Mechanisms
1024(1)
Choosing a Monitoring Protocol
1024(6)
Event Management Concepts
1030(1)
Purposes and Types of Events
1030(1)
Exception Monitoring
1031(1)
Informational Monitoring
1032(1)
General SBC Monitoring
1032(1)
General Platform Assurance
1032(2)
Voice/Video Assurance
1034(1)
Security Assurance
1035(1)
Advanced Call Monitoring
1035(1)
Call Detail Record (CDR) Analysis
1036(2)
Media Quality
1038(1)
Big Data Log Analysis
1039(1)
IOS and CUBE Device Monitoring
1040(1)
General Cisco IOS and IOS XE Monitoring
1040(2)
IOS XE REST API
1042(2)
CUBE Monitoring
1044(4)
Prime Collaboration Assurance
1048(2)
Management
1050(19)
Access Management
1050(1)
General Access Policies and Procedures
1051(2)
Cisco Access Policies and Procedures for CUBE
1053(4)
Call Detail Records (CDRs) for CUBE
1057(5)
Configuration Management
1062(1)
General Configuration Management
1062(1)
CUBE Configuration Management
1063(3)
Diagnostic Signatures
1066(1)
Diagnostic Signature Configuration
1067(2)
Summary
1069(1)
References
1070(3)
Appendix A: Q.850 Release Cause Values 1073(10)
Index 1083
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 Ciscos 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 masters 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 masters 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.