Marble VOIP Partners v. Zoom: VoIP Patent Case Transferred to N.D. California
Marble VOIP Partners, LLC asserted US7376129B2 — a patent covering collaborative applications over SIP-based VoIP networks — against Zoom Video Communications in the District of Kansas. After 391 days, the court granted Zoom's motion to transfer the case to the Northern District of California under 28 U.S.C. § 1404(a), shifting the forum to Zoom's home turf.
VoIP Patent Suit Against Zoom Moves from Kansas to Silicon Valley
On June 24, 2022, Marble VOIP Partners, LLC filed a patent infringement action against Zoom Video Communications, Inc. in the United States District Court for the District of Kansas. The single asserted patent, US7376129B2 (application no. US10/695856), covers enabling collaborative applications using Session Initiation Protocol (SIP)-based Voice over Internet Protocol (VoIP) networks — technology directly relevant to Zoom's core video-conferencing and communications platform.
On July 20, 2023, the Kansas District Court granted Zoom's Motion to Transfer Venue (Doc. 49) and ordered the case transferred to the Northern District of California pursuant to 28 U.S.C. § 1404(a). The recorded Basis of Termination for the Kansas docket is 'Case Transferred.' No merits ruling, claim construction order, or damages determination was issued by the Kansas court.
The transfer came 391 days after filing, before substantive patent litigation milestones were reached in Kansas. The grant of Zoom's § 1404(a) motion suggests the court found that the Northern District of California was a more convenient forum — consistent with Zoom's headquarters location — though the specific findings and balancing factors relied upon are detailed in the transfer order itself and not further summarised in the available record.
See Complete Case & Patent Analysis →Filing to Case Transferred in 391 days
391 days from filing to transfer order — case did not reach merits in Kansas
US7376129B2 — SIP-Based VoIP Collaborative Applications
Any company developing or deploying SIP-based VoIP infrastructure for collaborative applications — video conferencing, multi-party calling, CPaaS integrations, or cloud PBX — should evaluate freedom-to-operate against US7376129B2. The patent is actively asserted, and merits proceedings in the Northern District of California are pending. The relevant product categories include UCaaS platforms, SIP trunking services, and any application layer built on top of VoIP session management.
Official order — verbatim text
The court's order grants Zoom's Motion to Transfer Venue under 28 U.S.C. § 1404(a), directing the case to the Northern District of California. This is a purely procedural disposition: the Kansas court made no ruling on infringement, validity, or claim scope. The litigation continues in the transferee forum, meaning the substantive patent dispute over US7376129B2 remains entirely open.
What a § 1404(a) transfer means for this litigation
Under 28 U.S.C. § 1404(a), a district court may transfer a civil action to another district where it might have been brought, for the convenience of parties and witnesses and in the interest of justice. The Kansas court's grant of Zoom's motion means the case continues in the Northern District of California — it is not dismissed. No merits ruling was made in Kansas.
Forum change, not dismissalMarble VOIP must now litigate in N.D. California
The transfer requires Marble VOIP Partners to pursue its infringement claims in the Northern District of California — a venue perceived as more defendant-friendly in patent cases and geographically closer to Zoom's operations. The patent claims remain live; the plaintiff retains its right to continue the action in the new forum.
Claims survive, forum shiftsZoom secures its preferred home-court forum
Zoom's successful § 1404(a) motion moves litigation to the Northern District of California, where Zoom is headquartered. This is a procedural win: Zoom avoids litigating on the plaintiff's chosen Kansas turf and gains the practical advantages of a more familiar and convenient forum, without any merits adjudication in its favour yet.
Procedural win for ZoomVoIP patent enforcement landscape shifts west
The transfer signals that SIP/VoIP patent plaintiffs asserting patents against large tech defendants headquartered in California may face § 1404(a) venue challenges when filing in remote districts. Companies in the collaborative-communications space should monitor the continuing proceedings in N.D. California, as claim construction and merits rulings there will shape enforceability of US7376129B2.
Watch N.D. California proceedingsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Marble VOIP Partners, LLC | Company | /Search in Eureka ↗ |
| Defendant | Zoom Video Communications, Inc. | Company | /Search in Eureka ↗ |
| Plaintiff counsel | Christopher J. Belter | Attorney | Counsel for Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Plaintiff counsel | James J. Kernell | Attorney | Counsel for Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Kyle D. Donnelly | Attorney | Counsel for Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Michael A. Siem | Attorney | Counsel for Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Michael J. Barresi | Attorney | Counsel for Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Avek IP LLC | Law Firm | Representing Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Goldberg Segalla, LLP (NYC) | Law Firm | Representing Marble VOIP Partners, LLCSearch in Eureka ↗ |
| Defendant counsel | Aaron E. Hankel | Attorney | Counsel for Zoom Video Communications, Inc.Search in Eureka ↗ |
| Defendant counsel | Andrew M. Long | Attorney | Counsel for Zoom Video Communications, Inc.Search in Eureka ↗ |
| Defendant counsel | Anita Liu | Attorney | Counsel for Zoom Video Communications, Inc.Search in Eureka ↗ |
| Defendant counsel | B. Trent Webb | Attorney | Counsel for Zoom Video Communications, Inc.Search in Eureka ↗ |
| Defendant counsel | Jason R. Mudd | Attorney | Counsel for Zoom Video Communications, Inc.Search in Eureka ↗ |
| Defendant law firm | Shook, Hardy & Bacon LLP (Houston) | Law Firm | Representing Zoom Video Communications, Inc.Search in Eureka ↗ |
| Defendant law firm | Shook, Hardy & Bacon LLP (KC/Grand) | Law Firm | Representing Zoom Video Communications, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Kansas District CourtSearch in Eureka ↗ |
R&D signals in the SIP-based VoIP and UCaaS patent space
Forward-looking patent intelligence around SIP, VoIP collaborative applications, and the innovation posture of Marble VOIP Partners and Zoom Video Communications.
Marble VOIP Partners' SIP/VoIP assertion portfolio
Marble VOIP Partners has asserted US7376129B2 in at least this action. Understanding the full breadth of patents assigned to or associated with Marble VOIP Partners — including related continuations, divisionals, or family members in the SIP/VoIP space — can reveal the scope of assertion risk for UCaaS vendors beyond this single case.
PAE portfolio mappingSIP-based VoIP patent filing trends in collaborative communications
Filing activity around SIP session management, collaborative application enablement, and VoIP signalling protocols has accelerated alongside UCaaS adoption. Mapping patent density and forward citations from US7376129B2 can identify which areas of the SIP/VoIP stack carry the highest assertion risk and where whitespace exists for defensive innovation.
SIP VoIP filing trendsZoom's patent portfolio in VoIP and real-time communications
Zoom Video Communications has built a substantial patent portfolio in video conferencing, real-time communications, and network infrastructure. Analysing Zoom's own SIP, RTP, and WebRTC-related filings can reveal whether it holds defensive assets capable of cross-licensing or countering assertion in the collaborative-communications domain.
Zoom defensive IPAdjacent innovation opportunities near US7376129B2's claim scope
The claim space around SIP-based collaborative application enablement may contain white space in areas such as AI-enhanced session orchestration, encrypted SIP signalling, and cross-platform VoIP interoperability. Identifying under-patented adjacent areas near US7376129B2 can guide defensive filing strategies for UCaaS product teams.
VoIP white spaceSimilar SIP/VoIP Patent Infringement Cases in U.S. District Courts
Explore comparable SIP-based VoIP patent infringement actions filed in U.S. district courts, including cases transferred to the Northern District of California against major UCaaS defendants.
What this case signals for the VoIP and UCaaS IP landscape
A venue transfer to N.D. California reframes how SIP/VoIP patent holders should structure enforcement strategies against major tech defendants.
Venue selection is a critical first decision in VoIP patent enforcement
This case illustrates that filing a VoIP patent suit in a plaintiff-preferred district against a defendant headquartered in California carries significant § 1404(a) transfer risk. Patent holders asserting SIP/VoIP technologies against large tech companies should conduct venue analysis — including Zoom's principal place of business and witness location — before filing.
US7376129B2 remains live — N.D. California merits proceedings to watch
No merits ruling has been issued on US7376129B2. The Northern District of California will now handle claim construction, validity, and infringement analysis. Competitors in the video-conferencing and UCaaS sector should monitor those proceedings closely, as outcomes will affect the patent's enforceability across the industry.
Marble v Zoom — key questions answered
Marble VOIP Partners, LLC filed a patent infringement action against Zoom Video Communications, Inc. in the District of Kansas on June 24, 2022, asserting US7376129B2. On July 20, 2023, the court granted Zoom's Motion to Transfer Venue and ordered the case transferred to the Northern District of California under 28 U.S.C. § 1404(a). No merits ruling was issued in Kansas.
US7376129B2 (application no. US10/695856) covers enabling collaborative applications using Session Initiation Protocol (SIP)-based VoIP networks. It was asserted against Zoom because Zoom's video-conferencing and collaborative-communications platform operates over SIP-based VoIP infrastructure, making it potentially within the scope of the patent's claims.
The Kansas District Court granted Zoom's Motion to Transfer Venue under 28 U.S.C. § 1404(a), which allows transfer to a district where the case might have been brought, for convenience of parties and witnesses and in the interest of justice. The specific balancing factors relied upon by the court are detailed in the transfer order (Doc. 49) and are not further summarised in the available public record.
The transfer to the Northern District of California is not a dismissal. The infringement claims asserted under US7376129B2 remain live and the case continues in the transferee court. No merits ruling, claim construction, or damages determination was issued by the Kansas court.
The transfer illustrates that SIP/VoIP patent plaintiffs filing in remote districts against California-headquartered defendants face meaningful § 1404(a) venue transfer risk. UCaaS and video-conferencing companies should monitor the N.D. California proceedings, as claim construction and merits rulings on US7376129B2 will affect the patent's enforceability across the sector.
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