Matrix Partners, established in 1977, is a prominent venture capital firm headquartered in San Francisco, California. The firm focuses on early-stage and early-growth investments, partnering with entrepreneurs to build significant, industry-leading companies. With a global perspective and local expertise, Matrix combines the insights of former entrepreneurs and experienced investors to guide its portfolio companies. The firm has a proven track record, having invested in over 500 companies, with 50 going public and 75 achieving profitable M&A exits. Notable investments include Baidu, Apple, and Oculus. Matrix invests across various sectors, including applied AI, B2B SaaS, digital health, and sustainable-defined hardware.
2601, Taikang Financial Tower, No.38, East 3rd Ring Road North, Chaoyang District, Beijing 100026, China
101 Main St. 17th Floor Cambridge, MA 02142
535 Mission St. Suite 2600 San Francisco, CA 94105
260 Homer Ave, Suite 201 Palo Alto, CA 94301
Ben Altshuler
Partner
Diana Kimball Berlin
Partner
Rahul Chaudhary
Venture Partner
Phyllis Doherty
Administrative Partner
Paul Ferri
Co-Founder
Liza Gurtin
Partner
Wan Haoji
Partner
Patrick Malatack
Partner
Bo Shao
Founding Managing Partner
Paul Sherer
Venture Partner
Ilya Sukhar
Partner
Sun Linghao
Managing Partner
Tong Ti
Vice President
Kevin Xiong
Partner
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.
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 developing scalable, IP-optimized networking components that support the convergence of real-time media services with IP networks. The company creates Internet Protocol (IP) enhanced communications infrastructure equipment, including technology media servers and media firewalls. These products are designed for leading original equipment manufacturers (OEMs) and VoIP service providers, enabling them to enhance their service offerings and improve communication capabilities. SnowShore Networks focuses on delivering reliable and efficient solutions for the evolving demands of digital communications.
SnowShore Networks
Series B in 2001
SnowShore Networks specializes in developing scalable, IP-optimized networking components that support the convergence of real-time media services with IP networks. The company creates Internet Protocol (IP) enhanced communications infrastructure equipment, including technology media servers and media firewalls. These products are designed for leading original equipment manufacturers (OEMs) and VoIP service providers, enabling them to enhance their service offerings and improve communication capabilities. SnowShore Networks focuses on delivering reliable and efficient solutions for the evolving demands of digital communications.
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 specializes in providing voice-over-broadband solutions tailored for next-generation carriers. The company has established itself as a leader in the market, with over 40,000 lines currently in active commercial service. TollBridge develops IP-based voice systems designed to deliver cost-effective, toll-quality voice and integrated data services. Its VoIP gateways utilize the TollVoice architecture, which facilitates the transition of voice data from an IP network to Class 5 switches. This technology supports small business and consumer markets across various broadband access methods, including DSL, cable, and wireless networks.
TollBridge Technologies
Venture Round in 2000
TollBridge Technologies specializes in providing voice-over-broadband solutions tailored for next-generation carriers. The company has established itself as a leader in the market, with over 40,000 lines currently in active commercial service. TollBridge develops IP-based voice systems designed to deliver cost-effective, toll-quality voice and integrated data services. Its VoIP gateways utilize the TollVoice architecture, which facilitates the transition of voice data from an IP network to Class 5 switches. This technology supports small business and consumer markets across various broadband access methods, including DSL, cable, and wireless networks.
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.
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