Defendant
8 cases as defendant.
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Metaswitch Networks Ltd. (commonly "Metaswitch"; formerly Data Connection Ltd) is a UK-based telecommunications software company founded in 1981 by seven former IBM employees led by Ian Ferguson. It is headquartered in Enfield, England. Long privately held — Francisco Partners took a controlling stake in 2008 alongside Sequoia Capital — the company was acquired by Microsoft in July 2020 (reported at roughly $270 million), then sold by Microsoft to Utah-based cloud communications provider Alianza, a deal announced December 2024 and completed in March 2025. Metaswitch is now a subsidiary of Alianza. Headcount has been cited around 700 employees (2011 estimate); a reliable current figure is not available, and revenue is undisclosed.
Products / operations. Metaswitch developed carrier-grade, largely software-based communications infrastructure. Its Carrier Systems line included softswitches, the MetaSphere call feature server, the Rhino Telephony Application Server, IMS core software (including the open-source Project Clearwater), and the Perimeta session border controller family. Its Network Technologies division licensed portable protocol stacks and software components (SIP, Diameter, H.248/Megaco, SBC stacks) to OEM equipment vendors. Its software is aimed at network operators migrating voice and multimedia services to IP, VoLTE/VoWiFi, and IMS architectures; the company claimed more than 750 operator customers.
Patent-litigation posture. This is an operating company, not an NPE. The tracked record shows 2 cases as defendant and 1 as plaintiff — all against direct competitors, none against a shell licensor. Both district court suits were filed in the Eastern District of Texas, Marshall Division, a historically plaintiff-friendly venue.
Notable cases. Genband US LLC v. Metaswitch Networks Ltd. (E.D. Tex., 2014) went to jury and bench trial; the Federal Circuit affirmed denial of Genband's permanent injunction (861 F.3d 1378, 2017). Sonus Networks, Inc. v. Metaswitch (E.D. Tex., 2018) followed the Sonus–Genband merger, with Metaswitch counterclaiming; Metaswitch also filed an antitrust action against Genband in the Southern District of New York. Metaswitch Networks Ltd. v. Genband US LLC (Fed. Cir., 2018) is the plaintiff-side appeal.
Sonus Networks, Inc. sued Metaswitch Networks Ltd. and Metaswitch Networks Corp. in a case involving U.S. 6,885,658. The case was stayed pending appeal of the related -33 case, then settled and dismissed with prejudice in 2019.
Sonus Networks (later associated with Ribbon Communications) sued Metaswitch, with U.S. Patent No. 6,934,279 among the asserted patents. The parties mediated and settled; the case was dismissed with prejudice on July 1, 2019.
Sonus Networks sued Metaswitch Networks Ltd. and Metaswitch Networks Corp. in E.D. Tex., alleging continuing infringement of patents from the earlier 2:14-cv-00033 action and false advertising. The Stanford NPE Litigation Database lists this case as involving U.S. Patent No. 7,995,589. The parties settled and the court dismissed the case with prejudice on July 1, 2019.
Sonus Networks, successor-in-interest to Genband, sued Metaswitch in the Eastern District of Texas asserting U.S. 7,990,984. The parties settled through mediation, and the case was dismissed with prejudice on July 1, 2019.
Genband US LLC sued Metaswitch Networks Ltd. and Metaswitch Networks Corp. for infringement of seven patents including U.S. 6,885,658. A jury found Metaswitch infringed all asserted claims, including '658 claims 1 and 11, and the claims were valid, awarding $8,168,400; final judgment was entered March 22, 2018.
Genband asserted the '589 Patent, including claim 15, along with six other patents against Metaswitch. A jury found infringement and validity on January 15, 2016, awarding $8,168,400; the court denied a permanent injunction and entered final judgment on March 22, 2018. The case was closed April 10, 2018.
First Federal Circuit appeal from the Genband/Metaswitch district court case. The Federal Circuit vacated the district court's denial of a permanent injunction and remanded for reconsideration of the irreparable-harm standard.
Sonus Networks sued Metaswitch entities in the Eastern District of Texas, asserting the '971 Patent among other patents. The case was settled and dismissed with prejudice on July 1, 2019. The narrative notes conflicting filing dates (March 8, 2018 per SEC disclosure; April 18, 2018 per docket summary).