Grandstream has completed in-depth interoperability testing with these SIP trunking solution partners. These partner products are compatible for trunk configuration with Grandstream’s IP PBX. Rigorous interoperability testing of our products and the below providers ensure end-users complete compatibility and a broad set of choices when deploying Grandstream’s IP PBX solutions.

3NG Networks

3NG Networks

3NG Networks provides a private label VoIP Reseller Program that enables service providers to sell SIP Trunking, Hosted PBX and other VoIP services to the SMB and Enterprise markets. The solution is turnkey, offering a robust VoIP Platform, Billing System, PSTN connectivity, and 24x7 Support in a fully branded environment.



AireSpring offers next-generation integrated, SIP/VoIP, voice, and data products geared to deliver power and flexibility at cost-effective rates. Information about AireSpring’s SIP products can be found at AireSpring VoIP/SIP Service. AireSpring continues to expand and diversify its SIP Trunking product line to satisfy the demands of the SMB to Enterprise market for flexible, customized solutions at cost-effective rates.

Appia Communications, Inc.

Appia Communications, Inc. Appia Communications, Inc. is a leading provider of networking and communication services to small to midsized businesses in the U.S. and Europe. Founded in 2001, Appia’s mission is to help customers realize the many benefits of IP technology for far less than the cost of an in-house implementation. Our managed solutions simplify operations and save capital and operating dollars.

Ark Telecom

Founded in 2006, Ark Telecom provides a complete suite of hosted Unified Communications Solutions ideally suited for small business and enterprise clients. Through a highly scalable IP communications system, Ark Telecom offers an all-in-one unified communication platform for voice, data, video and mobility communication across enterprise and multi-location businesses. Our offering include carrier-class telephony, messaging, presence, conferencing, mobility, video calling, call center, call recording, call accounting, SIP trunking, and other business communications functions suitable for small businesses to the enterprise.



babyTEL is an established company witha 15-year track record of developing innovative and successful new telecom products andservices, including the first platforms for the deployment of fax over IP in large-scale networks and networked unified messaging. Customers include major carriers and Fortune 10 companies. is a national communications provider offering businesses grade internet, on-demand office applications and IP-voice services across one of the largest and most advanced all IP voice networks in North America. Bandwidth provides its customers with unparalleled selection, savings and service backed by lifetime support, all from one trusted partner at a fraction of the cost. has been recognized by Inc. Magazine as the only telecom service provider to be listed in both the 2006 and 2007 lists as one of the fastest growing private telecommunications companies in North America.


BlinkMind Corporation is a cloud-based video conferencing service provider, specializing in the delivery of high quality video over the public internet. All video conferencing services are hosted in our own private cloud, serviced in four geographically redundant datacenters. We use, FlexBridge, our own software-based multipoint conferencing unit (MCU) to deliver up to 16 person video conferencing to a wide array of devices and interfaces. BlinkMind’s network also supports full enterprise VoIP services, turning your Grandstream video phone into an all-in-one voice & video communication solution.



 BroadVoice’s Internet phone system allows business and residential customers to use a cable modem, DSL modem, or another broadband connection to make and receive VoIP phone calls using a standard touchtone phone. Their “Bring Your Own Device” plans allow customers to utilize their own SIP devices, such as IP phones, softphones, and Asterisk PBXs. BroadVoice ensures accurate connectivity throughout the experience with their “SecureSIP” technology, while “SmartSIP” technology optimizes the routing of network voice traffic while providing the best possible quality voice transmission.


With headquarters in New York City, NY; Callcentric has been providing VoIP phone services since 2005. Callcentric's portfolio of business-grade SIP Trunking Service solutions for residential/business customers includes voice, fax, international DIDs in over 40 countries, toll-free DIDs, and more. Specializing in servicing the BYOD market, Callcentric is proud to maintain the "Gold Award" and their services have consistently been reviewed by leading industry sites/publications as being "Best in Class" for quality, customer service, and overall value.


Founded in 2001, CallMyWay is the leader Internet Telephony Service Provider in Costa Rica, proving a state of the art Internet Telephony services over a robust network and redundant switches, interconnected to tier 1 international carriers and all local Costa Rica operators.


Centuric is a full service Cloud computing company with a comprehensive suite of services designed to scale with your growing company. Centuric has been building high availability communication infrastructures since 2001 and understands how important it is to give you peace of mind when it comes to data protection and immediate availability. The company’s hosted containers and virtual servers are fully scalable, affordable and self-manageable. Centuric provides a secure environment for clients seeking a hosted solution rather than building their own physical infrastructure and hiring technical specialists.

Clarity Telemanagement

Clarity Telemanagement is a leading national and international Hosted IP PBX and SIP Trunk provider. Since 2003, Clarity has leveraged its expertise in telephony engineering and software design to deliver enhanced telephony solutions with superior quality and unparalleled scalability to small and medium sized businesses all over the world. Clarity Telemanagement IP solutions allow consumers and companies of any size to access the next generation of VoIP technology to communicate to the world for a fraction of the cost of traditional landline phone service. We pride ourselves in keeping our customers at the forefront of technology including providing the best business VoIP and SIP service, a full line of VoIP phones and hardware, and enhanced IP service solutions to meet any of your telecommunication needs.

Clearfly Communications

Clearfly Communications  is a leading voice services and broadband provider serving the majority of the US with a primary focus on solutions for small and medium size businesses. At the core of Clearfly’s value proposition is a suite of VOIP and SIP based products that replace legacy and traditional business voice line services for 5-500 employee companies. 

*UCM6100 series IP PBX certification

Comm Partners Connect

CommPartners Connect

CommPartners Connect is a nationwide IP-based network operator providing wholesale VoIP and enhanced IP applications to carriers, strategic partners and VARS. The CommPartners Connect IP network has been engineered to provide business-grade, IP-based voice and other value-added services. CommPartners Connect has obtained Competitive Local Exchange Carrier (CLEC) certifications in 49 states and the District of Columbia and certifications in Alaska are pending. With nationwide IP network coverage, CommPartners Connect delivers reliable, high quality, and competitively priced carrier and wholesale hosted IP services for business. CommPartners Connect’s wholesale services are supported by a scalable and automated OSS platform for billing and account management.

CORE Networks

CORE Networks  is a North America based ITSP that offers a variety of VoIP calling platforms, in addition to providing a wide range of cloud, computer and consulting services. CORE Networks VoIP solutions offer superior phone systems and immediate "Big Business" credibility. With unlimited long distance, low start-up costs, instant business continuity and more features to list, CORE Networks is a great choice for VoIP service in North America. 



Covad owns and operates the largest national broadband network, and today is the only national facilities-based provider of data, voice, and wireless telecommunications solutions for small and medium-sized businesses. They are also a key supplier of high-bandwidth access for telecommunications services providers like EarthLink, AOL, and AT&T. Covad broadband and voice over Internet protocol (VoIP) services are currently available in 44 states and 235 major markets and can be purchased by more than 57 million homes and businesses.



deltathree is a well-known provider of integrated Voice over Internet Protocol (VoIP) telephony services, VoIP products, hosted VoIP solutions, and infrastructure. deltathree offers high quality Internet telephony solutions that are viable and cost-effective alternatives to traditional telephone services.



Dexgate is the leading Italian group in the manufacture and distribution of IT products with a 200 turnover of more than 560 million euro. The network covers all the Italian provinces with about 200 sales outlets as of December 31st, 2006 divided between three distinct chains with the brand names Computer Discount, Compy and Amico.

DID Xchange


DIDXchange is the wholesale direct inward dialing electronic marketplace which Super Technologies, Inc. (since 1999) offers. It serves 12,500 telcos in 170 nations with the complete purchase and/or sale of DID/DDI of 55 countries.



Excel is a leading provider of SIP trunking services for small to medium sized businesses. Excel has deployed a near ubiquitous VoIP network in the United States. Excel’s SIP trunking portfolio is strategically designed to address evolving IP PBX customer requirements. Excel’s SIP trunking service provides partners with excellent features, such as virtual voice paths and advance rerouting, enabling unified communications.


As the world’s first pure SIP carrier, Flowroute delivers advanced SIP trunking that answers the needs of communications developers, SaaS service providers, and high-tech enterprises. Flowroute's unique technology and network services provide communications experts unparalleled performance, transparency and control of the voice communications that power their businesses.


Fusion SIP Trunking

Since 2007, Fusion SIP Trunking has enabled thousands of large and small businesses to save money by eliminating PRI trunks, analog lines and reducing hardware costs. They ensure optimal performance by closely managing their voice-optimized network for exceptional reliability, availability, security, and quality of service. In addition, Fusion offers a robust, carrier-grade network that ensures high quality, diversity and redundancy along with a proprietary, high availability cloud services platform that seamlessly integrates a full complement of cloud solutions.


IBBS provides fully-integrated data, voice and technical support services to simplify the delivery of advanced communications into the residential and commercial marketplace. Today, more than 250 broadband and cable providers trust IBBS to deliver the advanced services that create an unmatched end-user experience and measurable results.

award-winning DOCSIS-based cable provisioning and diagnostics technology and innovative services are supported by an expert team dedicated to helping customers create new revenue streams via new market opportunities, retain customers with advanced features, and attract new customers with valuable and differentiated service offerings.



ippi is a leading VoIP service provider with one million users in 120 countries that offers a suite of VoIP service options that bring the benefits of VoIP to almost any device. Since 2007 the company provides a variety of VoIP services including SIP accounts or SIP trunks and individual or business SIP service that includes unlimited VoIP calls and voicemails. Various ippi VoIP offerings also include advanced features such as compatible softphone applications, unlimited calls to landline and mobile phones as well as web call back.



Iristel is a leading global provider of VoIP services, with it headquarters in Toronto, Canada. The company offers a broad portfolio of IP services in Canada, including hosted IP PBX, virtual faxing, virtual roaming, and global IP trunking products and services. They specialize in PBX and VPN installations for enterprises with multiple locations. Iristel is a national VoIP service provider with the CRTC’s Competitive Local Exchange Carrier (CLEC) designation in Canada.

Ironton Global

Ironton Global is a leading global provider of wholesale, B2B and B2C cloud-based communication services. As a wholly owned subsidiary of ITC (Ironton Telephone Company) headquartered within the commonwealth of Pennsylvania- USA, IG encompasses over 105 years of service excellence in delivering quality voice communication.


Intelafone  Intelafone is a Voice over IP home and business phone provider that is designed to be a drop-in replacement for traditional telephone service while ensuring the same simplicity and quality as a landline. Using our customer’s high speed, broadband internet connection, Intelafone provides not only the ability to make and receive local and long distance calls but also take advantage of free phone features such as Voicemail, Caller ID, Call Forwarding, and more.

Lucidphone of MKN Group

LucidPhone is the service provider wing of MKN Group, wholesalers of Mobile Accessories and VOIP Supplies. Founded in Mississauga, Ontario, Canada in 2012, Lucidphone offers low-cost international and domestic calling plans and is compatible with Grandstream devices.

Mango Telecom

Mango Telecom  is the first Russian provider of SaaS-based communication services as well as a key SIP- provider and software developer. Mango Office, the service offering of Mango Telecom, includes telecom services such as Virtual PBX, SIP, long-distance services, cloud CRM, and more.


Megafon is the second largest mobile operator in Russia in terms of number of subscribers and revenue, with a strong brand name and a European-level of service. The company uniquely launched its own network across Russia, providing a full range of mobile services across the country. In addition, subsidiaries of MegaFon work in Tajikistan, Abkhazia and South Ossetia



MegaPath is the leading provider of managed IP communications services in North America. MegaPath leverages its wide selection of broadband connectivity, Virtual Private Networks, Voice over IP (VoIP) and security technologies to enable businesses to lower costs, increase security and enhance productivity. Businesses of all sizes can easily and securely communicate between their headquarters, branch offices, retail locations, mobile workers, and business partners.

Netlink Voice

Netlink Voice
specializes in simplifying communications. Offering a wide range of products and services, multiple partnerships with enhanced fiber optic networks, world class datacenter, and experienced local customer service, all for the value that will help your bottom line. We deliver reliable broadband and voice solutions at competitive prices to keep your business running.


Nexogy Founded in 1999, Nexogy has helped thousands of businesses solve telephony and telecommunication challenges. You too can rely on Nexogy's innovative solutions, and outstanding support and customer service, to take your business communications to the next level. Nexogy provide telephony services to thousands of customers including inter-exchange carriers, internet service providers, individuals and corporate customers with an emphasis on small- to medium-sized businesses.

nexVortex, Inc.

provide telecommunications services businesses throughout the United States. It offers SIP trunking, conferencing, VoIP and SIP consulting, architecture and network design, system design, software implementation, and systems integration and testing services. The company was founded in 2002 and is based in Herndon, Virginia. nexVortex is an UNCOMMON company delivering Uncommon Service to customers, while excelling through technical Know-How and an unbending Commitment to our customers. Our mission is to provide our business customers with the IP knowledge, services and capabilities they need to improve their business communications easily and affordably. 

*UCM6100 series IP PBX certification

openIP, Inc.

founded in June 2005, OpenIP is an internet & telephony operator specialized in unified communication solutions for businesses. Through its Reseller Division, OpenIP distributes its solutions across a network of nationally certified integrators, and offers enterprises a full solution that includes IP Telephony (iPBX, iPCentrex, SIP Trunking, iPFax), broadband internet access (xDSL, EFM and optical fiber), as well as a diversity of Cloud Hosted Unified Communication solutions (UCaaS). Through its Operator Division, OpenIP offers Infrastructure as a Service (IaaS) including internet & telecommunication services, as well as a wide range of Telephony and Collaboration services (UCaaS). 


Phone Power’s award-winning residential and small business service packages range from ultra-low-cost metered outbound calls, unlimited inbound residential service, all the way up to virtually unlimited outbound calls including a secondary Cloned Line and virtual numbers. Phone Power combines the highest quality customer service along with a competitive mix of pricing and features.



provides access to more than 7,500 North American rate centers and hundreds of international cities, its unique overlay network and intelligent service delivery platform has evolved into a thriving ecosystem of power users and application developers.


Ringo Located in Vienna, Va., Ringio is the first cloud-based Rich Calling Service that intelligently routes calls to any phone in the world along with relevant information about the caller – making conversations more meaningful and productive. Integrating intelligent call routing and CRM data, Ringio provides capabilities previously available only through call centers and proprietary customizations – bringing Rich Calling Service down-market to small and medium-size businesses for the first time. By enhancing conversations with context about the caller, Ringio enables companies to significantly improve their interaction and service with the people who matter to their business.


RingOffice RingOffice is a leading VoIP phone service provider based in Toronto, Canada. The company prides itself in making business communication more efficient, more productive and less costly. Services offered include VoIP Business Lines, Cloud Hosted Phone Systems, Phone System Design, Implementation and Support, as well as Unified Communication Consulting. While RingOffice offers global reach, it specializes in serving businesses in Canada and the United States.



SigmaVoIP is a leading provider of Business Unified Communication Solutions provider. SigmaVoIP operates 9 data centers located in the US and Europe and has peering agreements with virtually every Tier 1 carrier.



Sipgate is a VoIP service provider based in Germany that also operates in the USA, United Kingdom, and Austria. Their service offers free calls between Sipgate users.  The company’s fee-based service allows for calls to domestic and international phone numbers. Sipgate allows users to use any SIP client software, SIP ATA, or hardware SIP phones with the service.



Skype is a software application that allows users to make voice calls and voice chats over the internet. Users can make calls to other users within the Skype service for free, while calls to traditional landline phones and mobile phones can be made for a fee using a debit-based account set up with Skype. Skype has 663 million registered users who made 95 billion minutes worth of voice and video calls in the first half of 2010, approximately 40% of which were video calls.



As the phone system manufacturer and the phone service carrier, Star2Star is the offers telecommunications solution that fully integrates end-to-end monitoring and management of business telecommunications needs.


Stonehenge Telecom is a single source voice communications provider, delivering the most complete business and personal communications services under one corporate brand including Hosted IP-PBX, a nationwide mobile network, tablet PCs and calling cards. Stonehenge's products and services are built using the most popular industry-standard operating systems and designed for easy set-up and use. Additionally, the company owns and operates a global VoIP network, allowing Stonehenge to provide a complete range of value-added packages for its customers.

Telaix Inc.

Telaix Inc.

Teliax’s mission is to provide the highest quality voice service to our customers through our network of top-tier peering partners while providing exceptional value to our customers and reseller partners. Teliax’s IVY platform enables partners to offer both trunking service and hosted PBX functionality along with an integrated invoicing and billing system. For other voice providers Teliax offers wholesale carrier services with unmatched service.



Telappliant owns one of the largest VoIP networks in the United Kingdom with over eighty thousand subscribers. The company targets a number of customer segments with their portfolio of products and services through four individual business units, each focusing on the needs of the individual market. Telappliant is a founding member of the Internet Telephony Services Providers Association (ITSPA.)


Ventengo is the VoIP service offering of Ventelo GmbH - a fully owned subsidiary of Cologne based QSC AG. Ventelo offers a wide variety of VoIP services on the Internet, cellular networks or traditional fixed networks. QSC offers small and mid-size enterprises a one-stop-shop for an extensive range of ICT services - from telephony, data transfer, housing and hosting to IT Outsourcing and IT Consulting. QSC Group, one of the leading mid-size providers of ICT and cloud services in Germany, offers custom-tailored solutions for individual ICT needs, as well as a comprehensive product portfolio for customers and marketing partners that can be adapted to suit varying communications and IT needs.


Vidanetwork provides VoIP application software that enables the delivery of hosted telephony and multimedia services as well as a complete line of IP-PBX and premise based call center solutions. Its flagship technology enables service providers and resellers to deliver next-generation voice and multimedia applications with advanced features that enable them to increase revenue, enhance competitive differentiation and elevate customer satisfaction. Vidanetwork’s family of software products delivers the scale, open architecture and reliability that companies demand.


Vitelity is a privately owned, international voice over IP (VoIP) technology provider. Vitelity offers wholesale voice, fax, SMS, and hosting services. Vitelity ensures network reliability by operating its own 50Gbit private dark fiber network and through interconnections in major cities throughout the United States, including Denver, New York City, Los Angeles and Miami. Vitelity maintains a five-star rating from, maintains an "A" rating with the Better Business Bureau and won IT Expo's most innovative new product award in 2009 and 2010.

With residential customers can save up to 66% on their phone bills. also offers best-in-class business solutions including hosted PBX and SIP trunking and they have a stellar industry reputation for tech support and customer service. Save money by switching to voip, save headaches by switching to!


Voicalls is a Toronto-based residential and business internet telephony service provider that serves all of Canada. Voicalls offers various plan levels to best suite any business or residential setting.


VOIPo is a fast growing, privately-owned, debt-free US-based VoIP provider that was founded in 2006 by veterans of the web hosting industry. VOIPo offers a variety of turnkey VoIP services for both home and small business users along with a wholesale SIP origination and termination offering, a comprehensive VoIP reseller program, and Hosted PBX services. All VOIPo services are backed with 100% US-based customer service and support. Visit to learn more.



Voxitas, a division of NetLogic, Inc., is a Quality of Service (QoS) Business-Class ITSP (Internet telephony service provider). The Company offers feature-rich, next generation VoIP (voice over Internet protocol) telephony services, utilizing SIP trunks. In addition, Voxitas provides long distance, Internet, toll-free and emergency 911 services to single and multi-site IPBX systems, in-bound and out-bound call centers, small to medium-sized enterprises, and wholesale carriers. Voxitas sells its products and services through a network of distributors, resellers, and private-label wholesalers.



Voyze is an Internet voice communication service provider that offers the most affordable longdistance service to Latin America and the rest of the world as well as VoIP business solutions forsmall and medium businesses. Voyze is targeted to U.S. Hispanics and Latin Americans, offeringthe highest quality and all the standard features of VoIP services. Voyze is owned by Future Voice, LLC, a Hispanic owned and operated international telecommunications company based in South Florida and specialized in VoIP technology.

Wind Currents Communications, Inc.

Wind Currents Communications, Inc.
is an Internet Phone Service company specializing in Voice-and-Video-over-IP (V2VIP™) products and calling plans. WCCI was established to serve clients and customers with quality and cost-effective products, such as desktop videophones, IP phones and cameras, bundled with affordable V2VIP™ services, and iV2VIP™ service used with
iPhones / iPads
for small-to-medium businesses, telemedicine and telehealthcare service delivery, government, security and monitoring applications.