Sequoia Capital

SignalWire is a Palo Alto-based company founded in 2017, offering a cloud communication platform that enables developers to integrate voice, messaging, and video capabilities into their applications using real-time APIs. Their primary product, SignalWire CLOUD, built on FreeSWITCH technology, allows for the creation of communications products and applications. They also provide SignalWire STACK, an open-source communications platform, and SignalWire Documentation, a web socket-based protocol for client libraries and real-time call control. SignalWire's mission is to create a global network for secure, standards-based real-time communication, accessible via simple SDKs and programming interfaces. Their products support audio/video applications in mobile browsers, AI bots, PSTN termination, and more, with a fully distributed workforce spanning multiple countries and time zones.

WhatsApp is a cross-platform mobile messaging app that enables users to exchange messages without paying for SMS. The service supports group chats and the sending of unlimited images, videos, and audio messages, using subscribers’ existing internet data plans. Available on major mobile platforms, WhatsApp focuses on simple, reliable communication for personal and small-group conversations worldwide.

RingCentral is a leading provider of unified communications as a service (UCaaS), offering a comprehensive cloud-based platform that integrates voice, video, messaging, and team collaboration tools. Headquartered in Belmont, California, the company serves over 350,000 organizations globally, enabling them to enhance communication and collaboration among remote and in-office teams. Its core products include RingCentral Office, which combines VoIP phone service with features such as unlimited calling and fax functionality, and RingCentral Professional, which provides virtual extensions for existing phone lines. Additionally, RingCentral offers a cloud-based contact center solution that allows businesses to connect seamlessly with their customers and a stand-alone video meetings platform. The company's solutions are designed to replace outdated on-premises systems with modern, flexible cloud-based alternatives, supporting a mobile workforce across various devices including smartphones, tablets, and computers. By streamlining communications and reducing reliance on traditional methods, RingCentral significantly enhances operational efficiency for businesses of all sizes.

WhatsApp is a cross-platform mobile messaging app that enables users to exchange messages without paying for SMS. The service supports group chats and the sending of unlimited images, videos, and audio messages, using subscribers’ existing internet data plans. Available on major mobile platforms, WhatsApp focuses on simple, reliable communication for personal and small-group conversations worldwide.

TokBox is a provider of a cloud-based platform that facilitates the integration of live interactive video, voice, and messaging capabilities into web and mobile applications. The company offers a proprietary OpenTok video platform, which enables users to engage in one-to-one calls as well as complex large-scale broadcasts. TokBox's services include customizable and flexible APIs that leverage advanced video, audio, and networking technology, ensuring an optimal user experience across various browsers and devices. Additionally, the company supports unified communications and contact centers, making its platform suitable for a wide range of commercial applications.

RingCentral is a leading provider of unified communications as a service (UCaaS), offering a comprehensive cloud-based platform that integrates voice, video, messaging, and team collaboration tools. Headquartered in Belmont, California, the company serves over 350,000 organizations globally, enabling them to enhance communication and collaboration among remote and in-office teams. Its core products include RingCentral Office, which combines VoIP phone service with features such as unlimited calling and fax functionality, and RingCentral Professional, which provides virtual extensions for existing phone lines. Additionally, RingCentral offers a cloud-based contact center solution that allows businesses to connect seamlessly with their customers and a stand-alone video meetings platform. The company's solutions are designed to replace outdated on-premises systems with modern, flexible cloud-based alternatives, supporting a mobile workforce across various devices including smartphones, tablets, and computers. By streamlining communications and reducing reliance on traditional methods, RingCentral significantly enhances operational efficiency for businesses of all sizes.

Sipera Systems is a leading provider of communications security solutions, specializing in the protection of Unified Communications (UC) systems. The company offers innovative products designed to secure various applications, including voice-over IP (VoIP), video conferencing, messaging, and collaboration tools. Sipera's "Borderless UC" approach allows secure communications across any device and location, facilitating the seamless adoption of advanced communication technologies. Supported by research from the Sipera VIPER Lab, the company's solutions address critical security needs such as remote workforce deployment, distributed call centers, and protection against toll fraud, while ensuring business continuity and compliance. By delivering application-layer security for real-time communications, Sipera enables organizations to operate in converged IP networks with reduced risk and enhanced returns on investment.

TokBox is a provider of a cloud-based platform that facilitates the integration of live interactive video, voice, and messaging capabilities into web and mobile applications. The company offers a proprietary OpenTok video platform, which enables users to engage in one-to-one calls as well as complex large-scale broadcasts. TokBox's services include customizable and flexible APIs that leverage advanced video, audio, and networking technology, ensuring an optimal user experience across various browsers and devices. Additionally, the company supports unified communications and contact centers, making its platform suitable for a wide range of commercial applications.

RingCentral is a leading provider of unified communications as a service (UCaaS), offering a comprehensive cloud-based platform that integrates voice, video, messaging, and team collaboration tools. Headquartered in Belmont, California, the company serves over 350,000 organizations globally, enabling them to enhance communication and collaboration among remote and in-office teams. Its core products include RingCentral Office, which combines VoIP phone service with features such as unlimited calling and fax functionality, and RingCentral Professional, which provides virtual extensions for existing phone lines. Additionally, RingCentral offers a cloud-based contact center solution that allows businesses to connect seamlessly with their customers and a stand-alone video meetings platform. The company's solutions are designed to replace outdated on-premises systems with modern, flexible cloud-based alternatives, supporting a mobile workforce across various devices including smartphones, tablets, and computers. By streamlining communications and reducing reliance on traditional methods, RingCentral significantly enhances operational efficiency for businesses of all sizes.

Metaswitch Networks Ltd. is a prominent provider of communications software solutions, specializing in the transition of networks to open, next-generation architectures. Established in 1981 and headquartered in Enfield, United Kingdom, with additional offices across major global cities, the company delivers a range of products, including 5G core solutions, protocol stacks for original equipment manufacturers, and various communication services such as VoIP, voice interconnect, and cloud network virtualization. Metaswitch's offerings also include MaX by Metaswitch, a product suite that enhances collaboration features for mobile network operators, allowing them to deliver comprehensive services to both businesses and consumers. Furthermore, the company provides professional services, technical support, and training to optimize the deployment and management of its solutions. Its reliable, scalable systems are utilized by numerous network operators globally and are integral to many leading communications equipment manufacturers.

Silent Communication, founded in 2004 and headquartered in Tel Aviv, Israel, specializes in mobile value-added services, focusing on call management, messaging, and visual voicemail solutions for mobile devices. The company has developed a Device and Network Agnostic (DANA) deployment technology that enhances the delivery of visual voicemail services. This innovative technology allows mobile operators to improve their messaging platforms, significantly reducing the number of missed incoming calls while simultaneously increasing revenue potential for the operators. Silent Communication aims to redefine communication services in the mobile industry by providing efficient and user-friendly solutions.

TokBox is a provider of a cloud-based platform that facilitates the integration of live interactive video, voice, and messaging capabilities into web and mobile applications. The company offers a proprietary OpenTok video platform, which enables users to engage in one-to-one calls as well as complex large-scale broadcasts. TokBox's services include customizable and flexible APIs that leverage advanced video, audio, and networking technology, ensuring an optimal user experience across various browsers and devices. Additionally, the company supports unified communications and contact centers, making its platform suitable for a wide range of commercial applications.

Sipera Systems is a leading provider of communications security solutions, specializing in the protection of Unified Communications (UC) systems. The company offers innovative products designed to secure various applications, including voice-over IP (VoIP), video conferencing, messaging, and collaboration tools. Sipera's "Borderless UC" approach allows secure communications across any device and location, facilitating the seamless adoption of advanced communication technologies. Supported by research from the Sipera VIPER Lab, the company's solutions address critical security needs such as remote workforce deployment, distributed call centers, and protection against toll fraud, while ensuring business continuity and compliance. By delivering application-layer security for real-time communications, Sipera enables organizations to operate in converged IP networks with reduced risk and enhanced returns on investment.

RingCentral is a leading provider of unified communications as a service (UCaaS), offering a comprehensive cloud-based platform that integrates voice, video, messaging, and team collaboration tools. Headquartered in Belmont, California, the company serves over 350,000 organizations globally, enabling them to enhance communication and collaboration among remote and in-office teams. Its core products include RingCentral Office, which combines VoIP phone service with features such as unlimited calling and fax functionality, and RingCentral Professional, which provides virtual extensions for existing phone lines. Additionally, RingCentral offers a cloud-based contact center solution that allows businesses to connect seamlessly with their customers and a stand-alone video meetings platform. The company's solutions are designed to replace outdated on-premises systems with modern, flexible cloud-based alternatives, supporting a mobile workforce across various devices including smartphones, tablets, and computers. By streamlining communications and reducing reliance on traditional methods, RingCentral significantly enhances operational efficiency for businesses of all sizes.

Sipera Systems is a leading provider of communications security solutions, specializing in the protection of Unified Communications (UC) systems. The company offers innovative products designed to secure various applications, including voice-over IP (VoIP), video conferencing, messaging, and collaboration tools. Sipera's "Borderless UC" approach allows secure communications across any device and location, facilitating the seamless adoption of advanced communication technologies. Supported by research from the Sipera VIPER Lab, the company's solutions address critical security needs such as remote workforce deployment, distributed call centers, and protection against toll fraud, while ensuring business continuity and compliance. By delivering application-layer security for real-time communications, Sipera enables organizations to operate in converged IP networks with reduced risk and enhanced returns on investment.

RingCentral is a leading provider of unified communications as a service (UCaaS), offering a comprehensive cloud-based platform that integrates voice, video, messaging, and team collaboration tools. Headquartered in Belmont, California, the company serves over 350,000 organizations globally, enabling them to enhance communication and collaboration among remote and in-office teams. Its core products include RingCentral Office, which combines VoIP phone service with features such as unlimited calling and fax functionality, and RingCentral Professional, which provides virtual extensions for existing phone lines. Additionally, RingCentral offers a cloud-based contact center solution that allows businesses to connect seamlessly with their customers and a stand-alone video meetings platform. The company's solutions are designed to replace outdated on-premises systems with modern, flexible cloud-based alternatives, supporting a mobile workforce across various devices including smartphones, tablets, and computers. By streamlining communications and reducing reliance on traditional methods, RingCentral significantly enhances operational efficiency for businesses of all sizes.

Santera Systems is a provider of advanced networking switching products tailored for the communications market. The company specializes in carrier-class, next-generation switches that facilitate both trunk and line functionality, enabling seamless migration from circuit to packet-based systems. Its core offerings include enhanced voice switching, integrated voice and data switching, and voice over broadband solutions. Through its innovative technology, Santera Systems delivers substantial capital and operating cost efficiencies ranging from 50 to 70 percent, making it a compelling choice for businesses seeking to optimize their voice and data transmission capabilities.

Brecis Communications is a communications company that specializes in advanced broadband multi-service network processor architectures. The company provides multiservice processors designed to assist enterprises and small businesses in implementing managed security and enhanced broadband services. Brecis develops embedded solutions for a range of applications, including security appliances, broadband routers, multiservice access devices, integrated access devices, and VoIP gateways. Their offerings include both silicon and software platforms that encompass voice processing, security, and packet processing capabilities, enabling efficient and secure communication solutions for various industries.

AccessLan, the Silicon Valley pioneer of PacketLoop, is a leading provider of business-focused and carrier-class access equipment for Integrated Communications Providers (ICPs). PacketLoop delivers the next generation of packet-based, local loop solutions, providing variable rate, multi-service intelligent infrastructure with Internet Scaling Architecture (ISA) enabling the industry’s first Quality-of-Service (QoS) for Internet Protocol (IP) management. It is ideally suited to delivery of packet-based services including: Voice-over-DSL (VoDSL), Internet access; Frame Relay; Virtual Private Network (VPN) and application hosting such as, streaming content and differentiated access services.

Provider of a software platform for advanced voice applications. The company's flagship Voice Web Application Platform enables both wireline and wireless service providers to deliver advanced, business-centric voice applications. By leveraging new technologies like Voice XML customer service, commerce transaction, and self-service applications provide a more personalized and interactive caller experience, and ensure that mobile corporate users have equal access to time-critical business and customer information.

Brecis Communications is a communications company that specializes in advanced broadband multi-service network processor architectures. The company provides multiservice processors designed to assist enterprises and small businesses in implementing managed security and enhanced broadband services. Brecis develops embedded solutions for a range of applications, including security appliances, broadband routers, multiservice access devices, integrated access devices, and VoIP gateways. Their offerings include both silicon and software platforms that encompass voice processing, security, and packet processing capabilities, enabling efficient and secure communication solutions for various industries.

VxTel provides silicon solutions for next-generation carrier networks. The company's products use a unique signal-processing architecture optimized for voice, data and telecommunication, and multimedia applications. By providing key technology for carrier class switches, VxTel will help accelerate the adoption and expansion of packet-based networks for voice and advanced services. The company's current focus is on enabling the highest density voice-over-packet systems supporting hundreds of thousands of channels across the full range of voice processing applications. VxTel, Inc. was founded in 1999 and is headquartered in Fremont, California.

Airslide Systems Inc. is a provider of 3G-IP convergence solutions for cellular networks. Airslide is a networking company with research, development, and design facilities in Israel. Airslide is the developer of Nebula Gateway technology. Airslide's markets itself as a provider of a cost effective 3G/IP solution for new cellular networks, by providing complimentary solutions for the current backbone infrastructure utilizing cutting edge IP convergence technology. The company’s solutions deal with the setback of dependency on wire-line technology. Airslide's Nebula Family of Gateways provides an IP-based converged cellular network. The company combines, signaling, voice, and data technology and converges them into one efficient cost-effective IP network. This convergence can be deployed through a phased migration, beginning with the SS7 signaling network. Airslide's SMS/IP offloading solution utilizes the SS7 signaling network from the SMS traffic onto an IP network. Following the installation and implementation of the Nebula Gateway SMS/IP solution, this signaling traffic can be offloaded onto an IP network. The company is based New York City, and has an additional office in Herzelia Pituach, Israel.

VxTel provides silicon solutions for next-generation carrier networks. The company's products use a unique signal-processing architecture optimized for voice, data and telecommunication, and multimedia applications. By providing key technology for carrier class switches, VxTel will help accelerate the adoption and expansion of packet-based networks for voice and advanced services. The company's current focus is on enabling the highest density voice-over-packet systems supporting hundreds of thousands of channels across the full range of voice processing applications. VxTel, Inc. was founded in 1999 and is headquartered in Fremont, California.

Brecis Communications is a communications company that specializes in advanced broadband multi-service network processor architectures. The company provides multiservice processors designed to assist enterprises and small businesses in implementing managed security and enhanced broadband services. Brecis develops embedded solutions for a range of applications, including security appliances, broadband routers, multiservice access devices, integrated access devices, and VoIP gateways. Their offerings include both silicon and software platforms that encompass voice processing, security, and packet processing capabilities, enabling efficient and secure communication solutions for various industries.

AccessLan, the Silicon Valley pioneer of PacketLoop, is a leading provider of business-focused and carrier-class access equipment for Integrated Communications Providers (ICPs). PacketLoop delivers the next generation of packet-based, local loop solutions, providing variable rate, multi-service intelligent infrastructure with Internet Scaling Architecture (ISA) enabling the industry’s first Quality-of-Service (QoS) for Internet Protocol (IP) management. It is ideally suited to delivery of packet-based services including: Voice-over-DSL (VoDSL), Internet access; Frame Relay; Virtual Private Network (VPN) and application hosting such as, streaming content and differentiated access services.

Santera Systems is a provider of advanced networking switching products tailored for the communications market. The company specializes in carrier-class, next-generation switches that facilitate both trunk and line functionality, enabling seamless migration from circuit to packet-based systems. Its core offerings include enhanced voice switching, integrated voice and data switching, and voice over broadband solutions. Through its innovative technology, Santera Systems delivers substantial capital and operating cost efficiencies ranging from 50 to 70 percent, making it a compelling choice for businesses seeking to optimize their voice and data transmission capabilities.

Lipstream Networks, Inc. is the Internet voice service provider for eBusiness. Lipstream enables live voice communication for eCommerce, customer service, education and community applications. Customers include AltaVista, English First, Excite@Home, Kana Communications, Miadora, MyFamily.com, PeopleSupport and Quintus.

Airslide Systems Inc. is a provider of 3G-IP convergence solutions for cellular networks. Airslide is a networking company with research, development, and design facilities in Israel. Airslide is the developer of Nebula Gateway technology. Airslide's markets itself as a provider of a cost effective 3G/IP solution for new cellular networks, by providing complimentary solutions for the current backbone infrastructure utilizing cutting edge IP convergence technology. The company’s solutions deal with the setback of dependency on wire-line technology. Airslide's Nebula Family of Gateways provides an IP-based converged cellular network. The company combines, signaling, voice, and data technology and converges them into one efficient cost-effective IP network. This convergence can be deployed through a phased migration, beginning with the SS7 signaling network. Airslide's SMS/IP offloading solution utilizes the SS7 signaling network from the SMS traffic onto an IP network. Following the installation and implementation of the Nebula Gateway SMS/IP solution, this signaling traffic can be offloaded onto an IP network. The company is based New York City, and has an additional office in Herzelia Pituach, Israel.

Assured Access Technology specializes in the development and manufacturing of networking equipment, focusing on solutions for carriers and service providers. The company offers a range of products, including multi-service access concentrators and network management systems, which facilitate both data and voice over IP (VoIP) services. Its LAN and WAN access technologies empower carriers and service providers to deliver a diverse portfolio of access solutions, enhancing the connectivity options available to their customers.