The IP telephony industry in nan focuses on modern communication technologies, allowing voice calls to be sent via the internet rather than traditional phone networks. Companies in this space range from startups to established corporations, all offering innovative solutions such as VoIP services, cloud communications, and unified communications tools. As remote work gains traction and businesses prioritize efficient communication, experts predict significant growth within this sector. Key trends include increased demand for integrated communication systems and solid remote support, creating new opportunities for innovation and service enhancement.

This list features a selection of 22 prominent IP telephony companies according to employee size, headquarters locations, and founding years. With established players like Mitel and innovative firms such as Grandstream Networks, each company specializes in unique offerings, ranging from VoIP technologies to integrated communication services. Their varied services cater to businesses across different industries, targeting universal communication and collaboration needs, reflecting evolving market trends and technological demands.

Continue reading to explore the top IP telephony companies.

Top 22 IP Telephony Companies

1. Mitel

• Website: mitel.com
• Ownership type: Private Equity
• Headquarters: Ottawa, Ontario, Canada
• Employee distribution: United States (USA) 19%, India 17%, Canada 11%, Other 52%
• Latest funding: $2.0B, April 2018
• Founded year: 1972
• Headcount: 1001-5000
• LinkedIn: mitel

Mitel Networks Corporation, based in Ottawa, Ontario, Canada, is a telecommunications company that has been operational since 1972. The firm specializes in providing Voice-over-IP (VoIP) solutions, unified communications, collaboration tools, and contact center services. Mitel serves a variety of industries, including healthcare, financial services, hospitality, and education, helping organizations improve their communication capabilities and customer interactions. With a workforce of approximately 3,932 employees, Mitel has a significant presence in the market. The company has also secured substantial funding, with a reported amount of $2 billion in 2018, which underscores its financial backing and potential for innovation in the telecommunications space.

2. Polycom

• Website: polycom.com
• Ownership type: Corporate
• Headquarters: San Jose, California, United States (USA)
• Employee distribution: China 30%, United States (USA) 29%, India 15%, Other 26%
• Latest funding: $2.0B, March 2018
• Founded year: 1990
• Headcount: 1001-5000
• LinkedIn: polycom

Polycom, Inc., founded in 1990 and headquartered in San Jose, California, is a telecommunications company that specializes in communication technology solutions. The company offers a range of IP phones and software packages designed for voice and video collaboration, primarily targeting businesses and organizations that require effective communication tools. Polycom's products are integral to modern communication infrastructures, enabling seamless connectivity and collaboration across various platforms. The company also emphasizes technical support and provisioning services to enhance user experience, ensuring that clients can maximize the utility of their communication systems. With a workforce of over 2,000 employees distributed across several countries, including significant operations in China, the United States, and India, Polycom maintains a global presence. Their last reported funding round in March 2018 raised $2 billion, reflecting strong investor interest and confidence in their business model and growth prospects.

3. Colt Technology Services

• Website: colt.net
• Ownership type: Corporate
• Headquarters: London, England, United Kingdom (UK)
• Employee distribution: India 43%, United Kingdom (UK) 17%, Spain 11%, Other 29%
• Latest funding: May 2016
• Founded year: 1992
• Headcount: 5001-10000
• LinkedIn: colt-technology-services

Colt Technology Services Group Limited, founded in 1992 and headquartered in London, is a telecommunications provider that specializes in connectivity solutions. With a workforce of over 5,200 employees, Colt serves enterprises across multiple sectors, helping them improve their digital infrastructure. The company offers a comprehensive suite of services, including network services, voice services, and cloud connectivity. Notably, Colt's voice offerings include SIP trunking, inbound and freephone services, and unified communications solutions, which are critical for modern IP telephony. Their commitment to customer service is reflected in their high Net Promoter Scores and numerous industry awards. Colt operates a robust network that connects thousands of enterprise buildings and data centers, ensuring that they can deliver reliable and scalable communication solutions to their clients.

4. Grandstream Networks

• Website: grandstream.com
• Ownership type: Private
• Headquarters: Boston, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 41%, Morocco 19%, Venezuela 13%, Other 27%
• Founded year: 2002
• Headcount: 201-500
• LinkedIn: grandstream-networks

Grandstream Networks, headquartered in Boston, Massachusetts, is a telecommunications equipment manufacturer that specializes in IP voice and video communications, networking solutions, and video surveillance. Established in 2002, the company has built a reputation for providing innovative products that enhance communication and collaboration for small and medium businesses, enterprises, and consumers alike. Grandstream's extensive product portfolio includes carrier-grade IP phones, hotel IP phones, Wi-Fi cordless IP phones, and a variety of PBX solutions, which are designed to meet the needs of various industries. The company operates on a global scale, with solutions deployed in over 150 countries, demonstrating its commitment to quality and reliability. Grandstream also emphasizes education and support through initiatives like the Grandstream Academy, which offers certification training for partners and users. Their focus on developing cutting-edge technology, such as the UCM6300 ecosystem, positions them as a significant player in the telecommunications sector.

5. Vonage

• Website: vonage.com
• Ownership type: Corporate
• Headquarters: Holmdel, New Jersey, United States (USA)
• Employee distribution: United States (USA) 42%, United Kingdom (UK) 20%, Poland 10%, Other 28%
• Latest funding: $6.2B, November 2021
• Founded year: 2001
• Headcount: 1001-5000
• LinkedIn: vonage

Vonage Holdings Corp., based in Holmdel, New Jersey, is a cloud communications provider that specializes in telecommunications services, particularly VoIP and unified communications. Founded in 2001, Vonage has evolved to offer a variety of solutions, including contact center services and communications APIs, which help businesses improve customer engagement and streamline their communication processes. The company serves a broad spectrum of industries, demonstrating its adaptability and commitment to enhancing communication capabilities. With a workforce of over 2,700 employees and a significant global footprint, Vonage has positioned itself as a key player in the telecommunications sector. Notably, the company secured $6.2 billion in funding in November 2021, underscoring investor confidence in its growth potential and strategic direction.

6. Yeastar

• Website: yeastar.com
• Ownership type: Private
• Headquarters: Xiamen, Fujian, China
• Employee distribution: China 90%, Italy 4%, Other 6%
• Founded year: 2006
• Headcount: 201-500
• LinkedIn: yeastar

Yeastar, established in 2006 and headquartered in Xiamen, Fujian, China, is a telecommunications company that specializes in Unified Communications and VoIP solutions. With a workforce of approximately 188 employees, Yeastar has developed a robust portfolio of products, including business phone systems, VoIP gateways, and integrated call center services. The company primarily targets small to medium-sized businesses and large enterprises across various sectors, including healthcare, education, and retail. Yeastar operates through a channel-focused model, which allows them to partner with distributors and IT service providers to deliver their technology solutions. Their commitment to innovation is reflected in their rapid product updates and the introduction of features that enhance customer experience. Yeastar has successfully installed over 250,000 PBX systems worldwide, demonstrating their significant presence in the market. They also offer extensive training and certification programs for partners, ensuring that their solutions are effectively implemented and supported.

7. Iristel

• Website: iristel.com
• Ownership type: Private
• Headquarters: United States (USA)
• Employee distribution: Canada 78%, Romania 22%
• Founded year: 1999
• Headcount: 51-200
• LinkedIn: iristel

Iristel is a telecommunications provider based in the United States, founded in 1999. The company specializes in a wide array of business communication solutions, including VoIP services, unified communications, and cybersecurity measures. Iristel serves businesses across multiple sectors, helping them improve their communication capabilities while also addressing cybersecurity threats. As a competitive local exchange carrier (CLEC), Iristel offers services such as cloud calling, SIP trunking, and managed cybersecurity solutions. The company has a significant presence in Canada, with a workforce that is primarily based there, and it has facilitated billions of voice minutes each month. Iristel's commitment to innovation and service quality has earned them recognition, including a nomination for Markham's 2024 Business Excellence Award.

8. ipvision a/s

• Website: ipvision.dk
• Ownership type: Private
• Headquarters: Grimstad, Agder, Norway
• Latest funding: December 2008
• Founded year: 2005
• Headcount: 51-200
• LinkedIn: ipvision

ipvision a/s, now known as Dstny, is a telecommunications provider based in Grimstad, Agder, Norway. Established in 2005, the company focuses on delivering business communication solutions that enhance collaboration and customer engagement. Dstny offers a comprehensive suite of services, including IP telephony, mobile communication, and data analytics. Their cloud-based solutions are designed to meet the needs of startups, small and medium-sized enterprises (SMEs), and larger enterprises, ensuring flexibility and scalability in communication. The company emphasizes the importance of customer experience and provides tools for effective communication, such as softphones, mobile apps, and integration with popular platforms like Microsoft Teams. Dstny's commitment to innovation and customer service has solidified its position in the telecommunications industry.

9. 4Com

• Website: 4com.co.uk
• Ownership type: Corporate
• Headquarters: Bournemouth, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 100%
• Latest funding: $267.8M, April 2024
• Founded year: 1999
• Headcount: 501-1000
• LinkedIn: 4com

4Com, founded in 1999 and based in Bournemouth, England, is a telecommunications company that focuses on providing business phone systems and related services tailored for small and medium-sized enterprises in the UK. The company offers a variety of products, including VoIP systems, broadband services, and software applications designed to improve communication and connectivity for businesses. Their flagship product, the HiHi3 phone system, integrates advanced features such as video calling and access to the Google Play Store, showcasing their commitment to innovation. 4Com has also been active in acquiring other companies to expand its customer base and service offerings, with recent acquisitions indicating a strategic approach to growth. In April 2024, they secured significant funding, further positioning themselves as a competitive player in the telecommunications sector. Their emphasis on customer service and support has earned them recognition, making them a trusted partner for businesses seeking to enhance their communication infrastructure.

10. Daisy Communications

• Website: daisycomms.co.uk
• Ownership type: Private Equity
• Headquarters: Brierfield, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 96%, New Zealand 3%
• Latest funding: February 2013
• Founded year: 2001
• Headcount: 1001-5000
• LinkedIn: daisycomms

Daisy Communications, founded in 2001 and based in Brierfield, England, is a telecommunications provider that specializes in business telecom solutions. With a workforce of around 364 employees, the company focuses on delivering a wide array of services, including connectivity, cloud solutions, mobile services, and notably, voice solutions. Their voice offerings include VoIP phone systems and SIP trunking, which are essential for businesses transitioning to modern communication methods. Daisy Communications serves approximately 175,000 businesses across the UK, emphasizing their commitment to enhancing communication and collaboration for small and medium-sized enterprises. The company prides itself on its UK-based customer service and has garnered a strong reputation, reflected in their high Trustpilot rating. They have not reported any recent funding, indicating a stable operational model since their last funding round in 2013.

11. Zadarma

• Website: zadarma.com
• Ownership type: Private
• Headquarters: London, England, United Kingdom (UK)
• Employee distribution: Poland 25%, Spain 25%, Kazakhstan 12%, Other 38%
• Founded year: 2006
• Headcount: 51-200
• LinkedIn: zadarma

Zadarma, founded in 2006 and based in London, England, is a private telecommunications company that specializes in VoIP services and virtual phone systems. With a workforce of around 34 employees, the company has a significant presence in various countries, including Poland, Spain, and Kazakhstan. Zadarma offers a range of products designed to enhance business communication, such as Cloud PBX, SIP trunking, and a multifunctional CRM system known as Teamsale. Their services are tailored primarily for small businesses and enterprises, aiming to provide cost-effective solutions that improve communication efficiency. The company has registered over 2 million users globally, indicating a strong market presence. Zadarma's commitment to continuous improvement and adaptation to the evolving needs of businesses positions it as a relevant player in the telecommunications industry.

12. Alltel Australia

• Website: alltel.com.au
• Ownership type: Private Equity
• Headquarters: Wheelers Hill, Victoria, Australia
• Employee distribution: Australia 76%, Philippines 24%
• Latest funding: $27.5B, May 2007
• Founded year: 2007
• Headcount: 11-50
• LinkedIn: alltel-pty-ltd

Alltel Australia, founded in 2007 and based in Wheelers Hill, Victoria, is a telecommunications provider focused on delivering tailored communication solutions primarily for businesses. With a workforce of around 34 employees, Alltel offers a range of services that include business phone systems, internet solutions, and contact center services. Their VoIP offerings, such as hosted voice and unified communications, are designed to help businesses streamline operations and improve customer interactions. Alltel operates throughout Australia, catering to various industries with customized solutions. The company has received significant funding, which underscores its potential for growth and innovation in the telecommunications sector.

13. Cohesive Technologies Pvt. Ltd.

• Website: cohesiveglobal.com
• Ownership type: Private
• Headquarters: Ghaziabad, Uttar Pradesh, India
• Employee distribution: India 94%, United States (USA) 6%
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: cohesive-technologies-pvt.-ltd.

Cohesive Technologies Pvt. Ltd., founded in 2009 and based in Ghaziabad, Uttar Pradesh, India, is a telecommunications provider that specializes in VoIP and communication solutions. The company has established itself as a player in the IP telephony market, offering a wide array of products such as IP voice and video telephony, IPPBX systems, gateways, and networking solutions. Their offerings cater to various sectors, including education, healthcare, and hospitality, demonstrating their adaptability to different business needs. Cohesive Technologies collaborates with notable technology partners like Grandstream, Epygi, and Yeastar to deliver innovative products and solutions. The company emphasizes enhancing customer engagement and operational efficiency through its technology solutions, which are designed to meet the demands of modern communication needs.

14. Granite Telecommunications

• Website: granitenet.com
• Ownership type: Private
• Headquarters: Quincy, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 99%
• Latest funding: Other (Grant), $600,000, June 2016
• Founded year: 2002
• Headcount: 1001-5000
• LinkedIn: granite-telecommunications

Granite Telecommunications, founded in 2002 and based in Quincy, Massachusetts, is a telecommunications provider that offers a wide array of communication solutions tailored primarily for businesses and government agencies. The company has established itself as a significant player in the industry, managing over 1.75 million voice and data lines across more than 650,000 locations. Granite's services include voice solutions like SIP trunks, UCaaS, and POTS replacements, which cater to the evolving needs of modern enterprises. With a strong emphasis on customer support and advanced technology, Granite has built a reputation for enhancing operational efficiency and reducing costs for its clients. The company has also received funding, which underscores its growth and commitment to innovation in the telecommunications sector.

15. NETCOM Business Contact Center

• Website: netcom.com.pa
• Ownership type: Private
• Headquarters: Costa Rica
• Employee distribution: Costa Rica 91%, Panama 4%, Colombia 3%, Other 3%
• Founded year: 2009
• Headcount: 501-1000
• LinkedIn: netcom-business-contact-center

NETCOM Business Contact Center, officially known as Network Communications S.A., is a telecommunications and technology service provider founded in 2009. With a workforce of over 1,100 employees, the company operates primarily in Costa Rica and Panama. NETCOM specializes in a range of services including IP telephony, contact center solutions, and cloud services, catering to the needs of small and medium-sized enterprises as well as larger organizations. Their contact center is equipped with state-of-the-art AVAYA technology, allowing them to offer multichannel communication solutions that go beyond traditional voice calls. NETCOM also provides technological leasing options, enabling businesses to access the latest communication technologies without significant upfront investments. Their commitment to training and certification ensures that their staff is well-equipped to deliver high-quality service. As a recognized partner of AVAYA, NETCOM is positioned to implement and maintain advanced communication systems, further solidifying their role in the telecommunications industry.

16. Digium

• Website: digium.com
• Ownership type: Corporate
• Headquarters: Huntsville, Alabama, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: August 2018
• Founded year: 1999
• Headcount: 51-200
• LinkedIn: digium

Digium, a subsidiary of Sangoma Technologies, is a telecommunications company based in Huntsville, Alabama. Established in 1999, Digium specializes in business communication solutions that include cloud, hybrid, and on-premises systems. The company is well-known for its contributions to open-source telephony projects, particularly Asterisk and FreePBX, which have become foundational technologies in the VoIP space. Digium's product portfolio features a range of services such as video conferencing, team collaboration tools, and contact center solutions, all designed to enhance communication and customer engagement for businesses. Their commitment to innovation and customer support is evident in their extensive partner network, which facilitates the installation and service delivery of their products.

17. Grupo UNION Telecom

• Website: uniontelecom.com.br
• Ownership type: Private
• Headquarters: Sao Paulo, Sao Paulo, Brazil
• Employee distribution: Brazil 100%
• Founded year: 2000
• Headcount: 51-200
• LinkedIn: union-telecomunica%c3%a7%c3%b5es

Grupo UNION Telecom, founded in 2000 and based in São Paulo, Brazil, is a private telecommunications company that offers a range of communication solutions tailored for businesses. Their portfolio includes VoIP services, cloud telephony, and technical support, aimed at enhancing communication capabilities while reducing operational costs. With a workforce of around 54 employees, the company prides itself on its expertise and has built a strong client base of approximately 11,500 customers throughout Brazil. UNION Telecom is recognized for its commitment to quality service, having received certifications such as ISO 9001, and is homologated by notable brands like Unify-Siemens and Digistar for specialized services. Their offerings also include a variety of products such as PABX systems, IP phones, and call center solutions, making them a significant player in the telecommunications industry.

18. Voxbeam

• Website: voxbeam.com
• Ownership type: Private
• Headquarters: Orlando, Florida, United States (USA)
• Employee distribution: Philippines 56%, United States (USA) 44%
• Founded year: 2011
• Headcount: 51-200
• LinkedIn: voxbeam

Voxbeam Telecommunications, based in Orlando, Florida, is a VoIP service provider that has been operational since 2011. The company focuses on wholesale voice termination and Direct Inward Dialing (DID) services, catering to service providers and organizations globally. Voxbeam prides itself on offering competitive pricing and high-quality communication solutions, which are crucial for businesses looking to manage international calling costs. The company has built a robust network with direct interconnects to over 500 leading mobile and fixed operators, allowing them to provide voice termination to more than 200 countries. Their service plans—Platinum, Gold, and Silver—are designed to meet varying customer needs, ensuring flexibility and choice. Voxbeam emphasizes transparency in its operations, providing clear rate information and dedicated customer support. This approach, combined with their advanced online reporting tools, positions Voxbeam as a reliable partner in the telecommunications industry.

19. VoIP Supply

• Website: voipsupply.com
• Ownership type: Corporate
• Headquarters: Amherst, New York, United States (USA)
• Employee distribution: United States (USA) 84%, Pakistan 5%, Bangladesh 5%, Other 5%
• Latest funding: June 2017
• Founded year: 2002
• Headcount: 11-50
• LinkedIn: voip-supply

VoIP Supply, founded in 2002 and based in Amherst, New York, is a telecommunications distributor that specializes in VoIP solutions. The company caters to a variety of clients, including businesses, consumers, and organizations, providing a comprehensive range of products such as VoIP phones, headsets, and cloud services. VoIP Supply prides itself on its customer-centric approach, emphasizing the importance of building lasting relationships with clients. With a dedicated team of professionals, the company has successfully shipped over 200,000 products worldwide, showcasing its operational capacity and industry knowledge. VoIP Supply also offers resources like VoIP buyers guides and provisioning services, further solidifying its role as a valuable partner in the IP telephony market.

20. Firstcom Europe (DK)

• Website: firstcomeurope.dk
• Ownership type: Corporate
• Headquarters: Denmark
• Latest funding: November 2013
• Founded year: 1965
• Headcount: 51-200
• LinkedIn: connection---a-firstcom-europe-company

Firstcom Europe (DK) is a telecommunications firm based in Denmark, established in 1965. The company specializes in cloud-based communication solutions tailored for businesses of various sizes. Their product suite includes hosted phone systems, SIP trunking, and mobile solutions, all designed to enhance communication efficiency and productivity. Firstcom Europe operates in multiple European countries, providing services that cater to a wide range of industries. They emphasize the importance of secure and accessible communication, allowing businesses to operate seamlessly from different locations. With a focus on user-friendly and effective solutions, Firstcom has positioned itself as a significant player in the telecommunications sector, particularly in the IP telephony space.

21. Gradwell

• Website: gradwell.com
• Ownership type: Private Equity
• Headquarters: Bath, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 100%
• Latest funding: July 2017
• Founded year: 1998
• Headcount: 51-200
• LinkedIn: gradwell

Gradwell Communications, founded in 1998 and based in Bath, England, is a telecommunications provider that focuses on delivering business communication solutions. The company offers a range of services, including VoIP phone systems, SIP trunks, and business broadband, primarily targeting small and medium-sized enterprises. Gradwell has built a reputation for its commitment to cloud technology and exceptional customer support, making it a reliable partner for businesses seeking efficient communication tools. In 2021, Gradwell expanded its capabilities by acquiring The Technology Group, which positioned them as the largest 3CX partner in the EMEA region. This strategic move has enhanced their service offerings and reinforced their presence in the IP telephony market.

22. Voipfone

• Website: voipfone.co.uk
• Ownership type: Private
• Headquarters: Southend-On-Sea, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 100%
• Founded year: 2004
• Headcount: 11-50
• LinkedIn: voipfone

Voipfone, based in Southend-On-Sea, England, is a telecommunications company that specializes in VoIP phone services and broadband solutions. Established in 2004, Voipfone caters to both residential and business customers, providing a range of services such as cloud PBX, call forwarding, and a softphone application. The company is recognized for its award-winning customer support, having won the Best VoIP award from the Internet Service Providers Association (ISPA) for five consecutive years. Voipfone's services are designed to facilitate the transition from traditional landline services to modern digital voice solutions, especially as the UK prepares for the discontinuation of its old telephone network by 2027. With a focus on flexibility and user control, Voipfone allows customers to easily manage their phone services online, making it a practical choice for users looking for efficient telecommunication solutions.

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