PSTN, VoIP & Cellular Technology Expert
Dr. Tal Lavian provides expert analysis and testimony in telecommunications and internet technology cases. His expertise spans PSTN and circuit switching to the protocols governing today’s Internet and cellular systems. His understanding of telecommunications architectures and their evolution informs his work on complex telecommunications issues in legal proceedings.
Dr. Lavian has spent nearly 20 years researching, studying, and lecturing at UC Berkeley. He holds a Ph.D. in Computer Science from UC Berkeley, specializing in network communications.
Academic and Industry Background
Dr. Lavian’s background combines academic research at UC Berkeley and hands-on industry experience across telecommunications and networking fields. His work covers communication service architectures, system designs, and operational implementations, including network system management, IT operations, client-server architectures, and network monitoring.
PSTN, VoIP & Cellular Technologies in Legal Proceedings
Dr. Lavian presents telecom concepts to legal audiences. With a Ph.D. from UC Berkeley, nearly 20 years of academic work there, and industry experience at Nortel Networks and as a DARPA Principal Investigator, he addresses historical and modern telecommunications systems, architectures, and protocols in patent litigation.
PSTN, VoIP & Cellular Technologies in Patent Disputes
Dr. Lavian’s expertise encompasses telecommunications technologies central to patent dispute cases, including circuit switching and packet switching systems used in the Internet, computer networks, and various communication networks. As a telecommunications expert, he provides technical analysis connecting technological details to their legal implications.
PSTN & VoIP Expert — Communication Networks Technologies
Dr. Lavian’s academic and hands-on experience covers designing and implementing telecom and unified communications systems, including:
- Computer networks, network architectures, network protocols, and communication systems.
- Communication devices, packet switching, networked systems.
- Internet technologies, distributed systems, and data center network architecture.
- Internet Technology & Infrastructure, Information Technology, client/server applications, and 3-tiered architecture.
- Network Communication Architectures, Network Infrastructure.
- Router, Switch, Bridge, Gateway, Edge Device, and core networking.
- Network Management, MIB, SNMP, Edge Router, Core Router, Gateway.
- Public switched telephone networks (PSTN), POTS, PBX.
- Circuit switching, SS7.
- Implementing such technologies over telecom and network communication systems, architectures, standards, and backend infrastructure.
- Transmissions, digital communications, interconnection networks, and network interfaces.
- SONET and SDH, Optical Networks, Optical Transport.
- Quality of Service (QoS) relates to telecom architectures and systems.
PSTN, VoIP & Cellular Expertise
Telecom, Networking, and Communications focus on the architecture, design, and implementation of data networks, communication systems, computer networks, and Web technologies. Moreover, Dr. Lavian consults on network communications systems, architectures, products, and protocols. He also consults on Computer networks, network architectures, network protocols, communication systems, communication devices, packet switching, networked systems, Internet technologies, distributed systems, and data center network architecture.
With the widespread adoption of the Internet and the World Wide Web, Dr. Lavian understands the technologies that have transformed our daily lives, including search engines, streaming, social media, communications, e-commerce, and banking. He is also well-versed in the technologies that have enabled the rise of smartphones and how they have changed how we consume information, connect with other applications, and communicate.
Telecom Networks
Telecom networks, such as the public switched telephone network (PSTN) and enterprise networks, connect users, devices, and systems across long distances. These networks comprise smaller interconnected networks, including fixed and mobile networks, and support various applications such as voice, data, and video. Over the years, the focus of these networks has shifted from speech operations to data communications, and the Internet has become a significant part of the telecom landscape. Network engineers must understand these networks’ architecture, design, and implementation to effectively support their operation and development.
PSTN, VoIP & Cellular Systems: Technical Expertise
Background
Dr. Lavian holds a Ph.D. in Computer Science from UC Berkeley, specializing in network communications, and spent nearly 20 years researching, studying, and lecturing at UC Berkeley. He served as Principal Scientist and Principal Architect at Nortel Networks (1996–2007) and as a DARPA Principal Investigator. Dr. Lavian has over 120 patents, over 25 scientific publications, and has been retained in over 70 cases — including 80+ depositions — before U.S. federal courts, PTAB, ITC, and international tribunals, on behalf of over 50 law firms and corporate clients.
Advanced Internet Technologies: The Core of Digital Communication
TCP/IP Protocols
As an expert in TCP/IP, Dr. Lavian clarifies the operations of these fundamental protocols. His knowledge is relevant to telecommunications patent litigation, where Internet technologies are often at the heart of the case.
Network Architecture: The Framework of Connectivity
Dr. Lavian’s understanding of network architecture, including client-server and peer-to-peer models, supports his analysis of network infrastructure patents in legal proceedings.
Foundational PSTN & Telecom Network Technologies
The Bedrock: Public Switched Telephone Network (PSTN)
Dr. Lavian’s work covers the PSTN landscape, from its traditional roots to its digital evolution, and its application in telecommunications patent disputes.
Cellular Systems: Evolution of Mobile Communication
Dr. Lavian’s work covers the history and development of mobile technologies and cellular networks, which arise in patent litigation involving mobile communications.
Synchronous Optical Networking (SONET/SDH)
Dr. Lavian’s analysis of SONET and SDH supports testimony in cases involving high-speed data transmission technologies.
The Role of a Technical Expert in PSTN, VoIP & Cellular Patent Litigation
Patent Analysis
Dr. Lavian analyzes telecommunications patents by examining each claim and its underlying technology. His analysis includes claim construction, infringement assessment, and validity evaluation.
Intellectual Property and Infringement Investigations
He compares technical features with patent claims to assess potential infringement or evaluate an invention’s novelty. This analysis supports both prosecuting and defending patent litigation cases.
Deposition and Trial Testimony
Dr. Lavian delivers depositions and testimony in court, drawing on his technical knowledge and experience. He has given 80+ depositions and testified before federal courts, PTAB, and the ITC.
– Dr. Lavian – PSTN, VoIP & Cellular Technology Expert
Dr. Lavian’s telecommunications expertise spans PSTN, VoIP, and cellular systems, covering both legacy and current technologies. He provides clear, evidence-based testimony as a telecommunications expert.
For inquiries, contact Dr. Lavian at +1 (408) 209-9112 or via the contact page.
Frequently Asked Questions
What does a telecommunications expert do in patent litigation?
A telecommunications expert provides technical analysis and testimony in patent litigation, ITC Section 337 proceedings, and federal court cases involving telecom technologies such as PSTN, VoIP, network communications, and Internet protocols. Dr. Lavian analyzes patent claims, provides claim construction opinions, writes expert reports, and testifies at depositions, PTAB hearings, and trials.
What telecom qualifications does Dr. Lavian have?
Dr. Lavian holds a Ph.D. in Computer Science from UC Berkeley specializing in network communications, served as a Senior Researcher at Nortel Networks, has 120+ patents in telecom, 25+ peer-reviewed publications, and has testified in 70+ federal court, PTAB, and ITC proceedings.
In which courts has Dr. Lavian testified as a telecommunications expert?
Dr. Lavian has provided expert testimony in U.S. federal district courts across multiple jurisdictions, the USPTO Patent Trial and Appeal Board (PTAB) in IPR proceedings, and the International Trade Commission (ITC). He has also testified in the Tax Court in Canada, and a court in Asia.
What telecommunications patent issues has Dr. Lavian addressed?
Dr. Lavian has addressed claim construction, infringement, and invalidity issues involving telephony protocols, cellular systems, VoIP, PSTN interfaces, network switching, and wireless communications standards.
How is a telecommunications expert used in patent litigation?
In patent litigation, a telecommunications expert like Dr. Lavian provides expert reports analyzing patent claims, claim construction opinions, infringement and validity analyses, deposition testimony, and trial testimony. Attorneys retain telecom experts to explain complex technology to judges, juries, and PTAB panels.
What companies has Dr. Lavian served as a telecom expert for?
Dr. Lavian has been retained in telecommunications patent cases involving major companies including Apple, Google, Microsoft, Samsung, Meta (Facebook), Cisco, AT&T, Verizon, T-Mobile, Juniper (HPE), Huawei, and many others, providing analysis and testimony on telecom protocols and systems.
What qualifications should a telecommunications expert have?
A telecommunications expert must demonstrate reliable methodology and relevant expertise. Dr. Lavian qualifies through his Ph.D. from UC Berkeley, 120+ patents, 25+ peer-reviewed publications, and 70+ cases where his methodology and opinions have been accepted by federal courts, PTAB panels, and the ITC.
What is the difference between a telecommunications expert and a general technology expert?
A telecommunications expert has specialized knowledge in telecom-specific technologies — PSTN, VoIP, cellular systems, signaling protocols, and telecom standards (ITU-T, 3GPP). Unlike a general technology expert, a telecom expert can analyze protocol-level details, carrier network architectures, and telecom-specific patent claims with the depth required for credible testimony.
How much does a telecommunications expert cost?
Telecommunications expert fees vary based on case complexity, scope of analysis, and whether testimony is needed at deposition or trial. Dr. Lavian provides rates commensurate with his credentials (Ph.D. UC Berkeley, 120+ patents, 70+ cases). Contact Dr. Lavian directly for a fee schedule and case evaluation.