Matrix Partners
Matrix Partners is a venture capital firm founded in 1977 and based in San Francisco that backs early-stage and Series A technology companies across sectors such as artificial intelligence, B2B software, consumer technology, fintech, health tech, infrastructure, and semiconductors. The firm emphasizes practical, founder-centered collaboration, often supporting concepts from idea stage through Series A and taking board seats to help portfolio companies scale. It operates globally, including Matrix Partners China, which focuses on long-term relationships with entrepreneurs in China and has a track record of IPOs and strategic exits. The team combines former founders and experienced investors to bring local execution and global perspective. Notable investments span across the technology landscape, reflecting a history of involvement with companies like FedEx, Apple, Oculus, Canva, Zendesk, HubSpot, Postmates, Fivetran, Sila, and GOAT, illustrating the firm’s ability to support companies from early development to scale.
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Past deals in VoIP
TT Yuyin
Series B in 2021
Quwan provides services including instant voice messaging, social gaming, esports, and game distribution. It operates TT Voice, which started as a voice chat application designed for mobile gamers and was later developed into a social gaming platform. It focuses on developing personalized services for the Gen Z audience.
TT Yuyin
Series A in 2020
Quwan provides services including instant voice messaging, social gaming, esports, and game distribution. It operates TT Voice, which started as a voice chat application designed for mobile gamers and was later developed into a social gaming platform. It focuses on developing personalized services for the Gen Z audience.
textPlus
Venture Round in 2015
textPlus, Inc., formerly known as GOGII Inc., provides WiFi-based mobile communication services globally through its textPlus app. Available on iOS, Android, and Windows devices, including smartphones, tablets, and Kindle Fire, the application allows users to make free calls to landlines and mobile numbers. The company was founded in 2007 and is headquartered in Marina del Rey, California.
textPlus
Series D in 2012
textPlus, Inc., formerly known as GOGII Inc., provides WiFi-based mobile communication services globally through its textPlus app. Available on iOS, Android, and Windows devices, including smartphones, tablets, and Kindle Fire, the application allows users to make free calls to landlines and mobile numbers. The company was founded in 2007 and is headquartered in Marina del Rey, California.
textPlus
Series C in 2011
textPlus, Inc., formerly known as GOGII Inc., provides WiFi-based mobile communication services globally through its textPlus app. Available on iOS, Android, and Windows devices, including smartphones, tablets, and Kindle Fire, the application allows users to make free calls to landlines and mobile numbers. The company was founded in 2007 and is headquartered in Marina del Rey, California.
textPlus
Series B in 2009
textPlus, Inc., formerly known as GOGII Inc., provides WiFi-based mobile communication services globally through its textPlus app. Available on iOS, Android, and Windows devices, including smartphones, tablets, and Kindle Fire, the application allows users to make free calls to landlines and mobile numbers. The company was founded in 2007 and is headquartered in Marina del Rey, California.
Digium
Series A in 2006
Digium, Inc. is a company that specializes in developing software and telephony hardware to create unified communications solutions for businesses of various sizes. Known for its open source telephony platform, Asterisk, Digium offers a range of products including business phone systems, IP phones, telephony cards, SIP trunking products, and VoIP gateways. The company also provides hosted and on-premises Switchvox business phone systems that deliver enterprise-class unified communications and UC-as-a-Service solutions. In addition to its hardware and software offerings, Digium offers training services and certifications related to the installation and maintenance of Asterisk systems. The company serves a diverse array of industries, including education, government, healthcare, and professional services, distributing its products through resellers and online partners worldwide. Founded in 1999 and based in Huntsville, Alabama, Digium became a subsidiary of Sangoma Technologies US Inc. in 2018.
SnowShore Networks
Series B in 2003
SnowShore Networks specializes in the development of scalable, IP-optimized networking components designed for carrier-class environments. The company focuses on enhancing Internet Protocol communications infrastructure, providing technology solutions such as media servers and media firewalls. These offerings are aimed at leading original equipment manufacturers (OEMs) and various Voice over Internet Protocol (VoIP) service providers, facilitating the integration of real-time media services with IP networks.
SnowShore Networks
Series B in 2001
SnowShore Networks specializes in the development of scalable, IP-optimized networking components designed for carrier-class environments. The company focuses on enhancing Internet Protocol communications infrastructure, providing technology solutions such as media servers and media firewalls. These offerings are aimed at leading original equipment manufacturers (OEMs) and various Voice over Internet Protocol (VoIP) service providers, facilitating the integration of real-time media services with IP networks.
Shoretel
Venture Round in 2001
ShoreTel, based in Sunnyvale, California, specializes in developing and selling Internet Protocol (IP) communication systems for enterprises both domestically and internationally. The company provides a range of solutions, including IP phones, voice switches, and service appliances, all built on a distributed software architecture that allows multi-site businesses to operate under a unified telecommunications system. Key offerings include the ShoreTel Communicator, which integrates IP telephony with instant messaging and video collaboration, as well as a contact center solution that efficiently routes incoming contacts. Additionally, ShoreTel supports businesses with custom application development, system design, installation, and training services. Founded in 1996, ShoreTel serves a diverse clientele, including small, medium, and large companies, as well as public institutions across various sectors such as education, healthcare, and technology.
TollBridge Technologies
Series D in 2001
TollBridge Technologies is a leading provider of voice-over-broadband solutions tailored for next-generation carriers, boasting over 40,000 lines in active commercial service. The company specializes in developing IP-based voice systems that deliver cost-effective, toll-quality voice and integrated data services. Its VoIP gateways utilize the TollVoice architecture, enabling the seamless transmission of voice from IP networks through Class 5 switches. This technology supports both small business and consumer markets, compatible with various broadband access technologies, including DSL, cable, and wireless networks. Through its innovative solutions, TollBridge Technologies plays a pivotal role in advancing the capabilities of voice communications in the digital age.
TollBridge Technologies
Venture Round in 2000
TollBridge Technologies is a leading provider of voice-over-broadband solutions tailored for next-generation carriers, boasting over 40,000 lines in active commercial service. The company specializes in developing IP-based voice systems that deliver cost-effective, toll-quality voice and integrated data services. Its VoIP gateways utilize the TollVoice architecture, enabling the seamless transmission of voice from IP networks through Class 5 switches. This technology supports both small business and consumer markets, compatible with various broadband access technologies, including DSL, cable, and wireless networks. Through its innovative solutions, TollBridge Technologies plays a pivotal role in advancing the capabilities of voice communications in the digital age.
Shoreline Teleworks
Venture Round in 2000
Shoreline Communications, based in Sunnyvale, California, was founded in 1996 and has been making Voice-Over-IP a reality for enterprise customers for nearly two years. Shoreline's award-winning IP Voice Communications System is based on a unique distributed architecture that links multiple customer locations into a single, integrated IP voice network. The system also provides both a rich set of integrated voice services as well as standards-based interfaces to 3rd party voice applications that enhance personal and organizational productivity. Powered by ShoreWare ™ server and call manager software, ShoreGear™ voice switches and ShoreCare™ support services, the Shoreline Communication System is the platform of choice for the enterprise and service providers.
Sonus Networks
Venture Round in 1999
Sonus Networks, now known as Ribbon Communications, specializes in Session Initiation Protocol (SIP)-based communication solutions and Session Border Controller (SBC) technology. The company provides these services to enterprises and service providers worldwide, facilitating Unified Communications in the Cloud. Additionally, Ribbon Communications offers mobile network operations and integrates solutions with Microsoft, enhancing connectivity and communication capabilities for its clients. By focusing on these areas, the company aims to streamline and secure communication processes across various platforms and networks.
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