The Best Third Party Verification Agencies

Looking for a top third party verification service?

This guide contains companies from all over the globe that excel in third-party verification. Their services vary from non-voice BPO/back-office services to voice services to transcription and they provide a multitude of other services your company may need. With all of these options, we know that it can be difficult to navigate the best company for you.

That's why we've created this list of the best third party verification companies for you to review. Read through company descriptions, former clients, and notable projects to find the best fit for your business.

List of the Best Third Party Verification Agencies

  • 1

    Callbox

    Callbox is a business process outsourcing company based in Encino, Calif., with offices in Singapore, Ultimo, Australia, and the Philippines. Founded in 2004, Callbox's team of 174 provides voice services and non-voice BPO/back office services.

    Notable Project

    Callbox was hired by an advertising company to take charge of its telemarketing and lead generation through its outbound calls. Previously the client was handling around 85 calls per day, which saves the client around 40 hours and $50 per month.

    "Their strongest point is their infinity call tracking...Their service is perfect for me." – Marketing Manager, Advertising Company

    Former clients
    TaxMatrix
    dcBLOX Inc.
    Malvern Panalytical
    Spruce Technology
    $ $ $ $ $
    equalizer

    Undisclosed

    group250 - 999 Employees
    place Encino, CA
    4.6
    4.6
    46 Clutch reviews
    Awards

    Contact Center World Awards Top Outsourcer of the Year (2008)

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  • 2

    GCS Agents

    GCS Agents is a contact center firm in Salisbury, N.C., founded in 2001. The team of 300 specializes in voice services, consulting, and BPO services for its majority midmarket clients across multiple industries. 

    Notable Project

    GCS Agents provided security consulting and analytics for an energy company's database servers. As a result, the client's security services and communication vastly improved, reducing its hours and money spent on the task.  

    "The data security and communications outside of my internal database was and is very excellent. I would love to give their name but I don't do that for security reasons." – IT Executive, Energy Company

    Former clients
    Bank of America
    AOL
    Verizon
    JCPenney
    $ $ $ $ $
    equalizer $50,000+
    group250 - 999 Employees
    place Salisbury, NC
    4.9
    4.9
    6 Clutch reviews
  • 3

    Salesify

    Salesify is an information technology firm that has offices in the United States, the Philippines, and India. Founded in 2005, Salesify's team of over 1,500 employees have over a decade of experience specializing in call center services. The firm also offers big data and back-office services to its clients. 

    Notable Project

    Salesify provided a technology firm with customer support and call center services. The client wanted to improve customer service and collect feedback from consumer interactions. The team at Salesify performed voice call services for the client. The firm collected and organized the data collected from the calls for the client. Salesify's efficiency particularly impressed the client. 

    "They can handle lots of traffic from consumers without failure." – VP of IT, Technology Firm 

    Former clients
    Microsoft
    IBM
    Oracle
    Cisco
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place Redwood City, CA
    4.5
    4.5
    5 Clutch reviews
  • 4

    Go4Customer

    Go4Customer is a contact center outsourcing company that is based in Noida, India with other centers in Jaipur, Mumbai, Bengaluru, Chennai, Ahmedabad, and Bhopal, India, South Tiverton, UK, and Houston. Since 2004, their team of over 200 experts have been providing voice/call center services and BPO/back office services. Go4Customer works with different industries including information technology, financial services, and consumer products.

    Notable Project

    An IT company wanted to smooth over how information enters and leaves the company, so they needed effective outbound services. Go4Customer improved the flow of calls, as well as provided lead generation services through telemarketing. The client is extremely confident in the work that Go4Customer has done.

    "They [Go4Customer] do their work quickly, safely, reliably, and they offer a good service despite the price." – Manager, IT Industry Company

    Former clients
    MSME
    BSNL
    TIMEX
    HudCo
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place Noida, India
    5.0
    5.0
    3 Clutch reviews
    Awards

    Rajasthan State Award for Export Excellence (2010-2011)

  • 5

    GroupOne

    GroupOne Health Source is a full service medical billing and consulting firm based in Jefferson City, Mo. Since 1991, their current team of 108 has been specializing in non-voice BPO services, voice services, and transcription for clients in the medical field. 

    Notable Project

    A health company needed assistance with their medical billing. GroupOne Health Source provided the long-term service at an affordable price. The staff now has less work to complete since the agency came aboard.

    "Our company saves 20 man-hours on a monthly basis."– Administrative Manager, Health Company

    Former clients
    Sunshine Pediatrics
    Prime Healthcare Providence
    South Boston Pediatrics
    Tampa Cardiac Specialists
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place Jefferson City, MO
    4.0
    4.0
    1 Clutch review
    Awards

    BBB: Accredited Business

  • 6

    AdvancedMD

    AdvancedMD is a business process outsourcing firm for the healthcare industry. Based in South Jordan, Utah, they have  a branch office in Springfield, Mass. The team was founded in 1999 and includes 590 employees. AdvancedMD offers a wide variety of solutions for independent practices. Their services include non-voice BPO, voice call outsourcing, and integration of medical and enterprise software.

    Notable Project

    AdvancedMD provides full-service back office support for a medical clinic in Florida. The services rendered include management of patient records, billing customer support, and business analytics. The client has noted a marked improvement in their practice's efficiency. Advanced MD's contribution is saving hundreds of dollars a month on customer support with strong results.

    "[AdvancedMD] Organizes your life in a simpler way, creating a more comforting work atmosphere, and the best results in less time." — Customer Service Manager, Healthcare Hospitality Clinic

    Former clients
    Lineagen
    Center for Balanced Health
    Greenhill Family Clinic
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place South Jordan, UT
    5.0
    5.0
    1 Clutch review
  • 7

    Unee Solutions

    Unee Solutions is a business process outsourcing firm based in Stafford, Texas with additional assets in India and Israel. They were founded in 2007 and currently have a staff of 125 employees. Unee Solutions' solutions focus on lead generation and include both voice outsourcing and non-voice back office services.

    Notable Project

    Unee Solutions provides voice lead generation for a luxury bed and breakfast in Colorado. The client wanted to stand out from crowded search results that prioritize large brands and partnered with Unee for a more distinct lead generation strategy. Unee's voice support agents provide outbound calls and booking over the phone. The team has considerably outperformed the client's original in-house efforts.

    "I was paying a couple of people roughly $1,500 per month to do it previously and they were only spending maybe 10 hours in total a week to produce 2 to 4 leads. Now I pay roughly $2,000 for unknown hours with 15 to 20 leads. Invaluable!" — Owner, Colorado Bed and Breakfast

    Former clients
    Kern
    Krohne
    Cimatron Group
    Jurat
    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Stafford, TX
    5.0
    5.0
    1 Clutch review
  • 8

    SupportYourApp

    SupportYourApp is a customer support outsourcing company based in Kiev, Ukraine. Founded in 2010, SupportYourApp's team of more than 400 employees provides non-voice BPO/back office services and voice services. 

    Notable Project

    SupportYourApp worked with this software development company to assist with technical customer support. Their wide range of service entails taking charge of all general, pre-sales, and technical questions about the client's Windows and Mac software products.

    "Our website is featured on Shopper Approved, where around 85% of feedback is more than satisfied with support." – Marketing Director, Software Development Company

    Former clients
    Sogro
    Coppertino, Inc.
    Petcube
    Macphun
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place Kyiv, Ukraine
    5.0
    5.0
    23 Clutch reviews
  • 9

    Specialty Answering Service

    Specialty Answering Service is a call center outsourcing firm based in King of Prussia, Penn. Founded in 1985, they have about 30 employees and work with a national network of freelance customer support specialists. Their services consist of voice customer support and non-voice business process outsourcing.

    Notable Project

    Specialty Answering Service serves as a dispatch and management center for a produce distributor. The client has an extensive range of end-clients and delivery providers that requires considerable monitoring and attention to detail. By migrating their dispatch to Specialty Answering Service, the client saved about 520 labor hours per month with comparable outcomes.

    "Their strength is professional handling of calls and increased knowledge of our business, customer service is easy to work with and courteous. Things have run smoothly so far." — Manager, Food Producer

    Former clients
    Bausch+Lomb
    Fujitec
    Colwell Banker
    $ $ $ $ $
    equalizer

    Undisclosed

    group10 - 49 Employees
    place King of Prussia, PA
    4.5
    4.5
    30 Clutch reviews
  • 10

    A1 Call Center

    A1 Call Center is a CISCO-based outsourcing call center in Noida, India. Founded in 2009, the company has a team of 6 that specialize in back office and call center services. They primarily work with clients in the consumer products, media, and education industries. 

    Notable Project

    A1 Call Center provided customer verification services for a telecommunications company. They conducted outbound calls to collect customer feedback. The former client used the collected data to update their policies and improve their services.

    "It has been a very happy, very enjoyable experience." – Administration Associate, Telecommunications Company 

    Former clients
    BetterU
    BIBA
    Network 18
    MMI Online
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place Noida, India
    4.8
    4.8
    3 Clutch reviews
  • 11

    4D Global

    4D Global is a medical billing company based in Chennai, India, with an office in Scottsdale, Ariz. Founded in 2015, the agency employs a team of over 50 to provide non-voice BPO/back office services and call center services to clients in the healthcare and medical industries.

    Notable Project

    4D Global worked with an IT company to assist in a variety of different projects, from staff augmentation and billing to retirement and health insurance management. With their keen business understanding, they delivered a tailored experience, saving the client about $100,000 per month.

    "Their quality of service is excellent." - IT Director, IT Company

    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Chennai, India
    4.7
    4.7
    3 Clutch reviews
  • 12

    Sound Telecom

    Sound Telecom is an answering services provider based in Spokane, Wash., with a team of 25. Founded in 1986, the team provides voice and transcription services for clients in a variety of industry.

    Notable Project

    Sound Telecom provided answering services with voicemail and call forwarding features for a healthcare company. The team recorded names and numbers to ease their return call process. All of these services were delivered on time.

    “They are prompt and answer in a personal and professional manner. They offer many benefits with their service. They are affordable and trustworthy.” — Manager, Healthcare Company

    Former clients
    Boeing
    Microsoft
    Starbucks
    iFly
    Charles River
    Pivot Data Centres
    $ $ $ $ $
    equalizer

    Undisclosed

    group10 - 49 Employees
    place Spokane, WA
    4.2
    4.2
    19 Clutch reviews
  • 13

    MattsenKumar LLC

    MattsenKumar is a back office services provider based in Woodburn, Ore., with an office in Gurgaon, India. Founded in 2010, MattsenKumar's team of 364 employees offers voice/call center services and non-voice BPO/back office services.

    Notable Project

    MattsenKumar was hired to take over the responsibility of answering this products firm's phone calls. Making up 25% of the client's employees' work, MattsenKumar has been able to fulfill its role by respecting deadlines and being able to solve customers' problems 90% of the time, with efficiency increasing with every month the company stays on.

    "Work these past months has been flawless. They are getting better with their dealings with customers and have been able to generate a strategy to solve the problems in the calls to be more efficient and effective each time." - Director, Products Firm

    $ $ $ $ $
    equalizer $1,000+
    group1,000 - 9,999 Employees
    place Woodburn, OR
    4.0
    4.0
    3 Clutch reviews
  • 14

    DataPlus

    DataPlus is a development and data entry agency in Hiram, Ga. Founded in 1992, they have at least 50 employees that serve clients in the healthcare, financial services, and business services sectors. DataPlus provides voice services and non-voice BPO/ back office services. 

    Notable Project

    A consumer products company hired DataPlus for their data entry & cleansing services. Using their services, the company's workload reduced by about 60%. DataPlus was up to the company's standards.

    "I believe that they help the company maintain deadlines; they respond quickly." — Administration Associate, Consumer Products Company

    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Hiram, GA
    4.4
    4.4
    7 Clutch reviews
  • 15

    Call2Customers

    Founded in 2011, Call2Customers is an outsourced call center in New Delhi, India with roughly 250 employees who provide voice and BPO services. They focus on B2B lead generation and B2C telemarketing for clients.

    Notable Project

    A consulting firm partnered with them for outsourcing services at a fair rate. Lead generation increased exponentially with help from the client who has a solid understanding of the market.

    “Call2Customers has a solid knowledge of the American market. They understand my requirements and how to approach marketing teams over here. They’ve even made good suggestions on how I can grow my business. It shows that they care about their work enough to do additional research.” – Owner, Consulting Firm

    Former clients
    HHC Consulting Inc.
    Talkwire
    8BIT
    NEO Trip
    Verified Learning
    SES
    Rayna B2B
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place delhi, India
    3.8
    3.8
    2 Clutch reviews
  • 16

    Calibrus

    Calibrus is a customer management contact center headquartered in Tempe, Ariz. Founded in 2013, they have about 40 employees that have clients in the business services, consumers products, financial service, healthcare, and retail industries. Their solutions include third-party verification, outbound lead generation, and hosted call recording.

    Notable Project

    Calibrus provides customer verification services for a mid-market business in Florida to increase their contact with their customers. Their' level of service impressed the client and saves their business around $2,000 monthly on labor and administrative costs.

    "I think their service is of good quality. The calls are well received and there are no complications." — Customer Service, Mid-size Firm

    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Tempe, AZ
    5.0
    5.0
    1 Clutch review
  • 17

    VoiceStamps

    VoiceStamps is a professional IVR hosting and design service provider based in Richardson, Texas. Founded in 1999, their now 2 person team specializes in voice services and transcription. VoiceStamps works with a variety of industries including business & financial services and healthcare.

    Notable Project

    An IT company hired VoiceStamps for their outbound dialing services. Their goal was to save money, considering they handle about 70% of calls a day. The client thinks VoiceStamps provides them with great work and information.

    "Their quality is their best strength."– Owner, IT Company

    $ $ $ $ $
    equalizer $1,000+
    group10 - 49 Employees
    place Richardson, TX
    5.0
    5.0
    1 Clutch review
  • 18

    NETCAST BPO

    Netcast BPO is a call center and back-office outsourcing firm headquartered in Henderson, Nev. with offices in Atlantic City, N.J. and the Philippines. Founded in 2011, they have about 200 employees, and exclusively hires English-fluent university graduates for their offshore operations. Their services include voice support and data entry.

    Notable Project

    Netcast BPO provides outbound phone marketing for a U.S. real estate firm. The client chose them based on their strong performance for other clients and well-regarded hiring practices. Netcast BPO's phone agents perform nearly 2500 outbound calls daily with strong lead generation.

    "It is an excellent firm and I have no complaints...we have worked with them ongoing for the past three years." — Senior Marketing Manager, Real Estate Firm

    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Henderson, NV
    5.0
    5.0
    3 Clutch reviews
  • 19

    Sunshine1

    Founded in 1975, Sunshine Communication Services is an answering service based in Coral Gables, Fla. Their team of about 10 specializes in voice and BPO services. 

    Notable Project

    A small company was having trouble keeping track of all the phone calls they were receiving. After searching, they decided Sunshine Communication Services were the best fit. They provided custom account design, scheduled phone reports, and more.

    "The benefits, however, are that all calls are answered." —Small Company

    Former clients
    Mayo Clinic
    Jacksonville Orthopaedic Institute
    University of Miami
    Volland and Associates
    $ $ $ $ $
    equalizer

    Undisclosed

    group2 - 9 Employees
    place Coral Gables, FL
    3.5
    3.5
    1 Clutch review
    Awards

    ATSI Award of Excellence (2016)

  • 20

    Direct TPV

    Direct TPV is a third party verification company that specializes in BPO and voice services. With over 50 employees, the team works with various industries such as business & financial services and telecommunications. 

    Notable Project

    Direct TPV has provided customer verification for a business services company for the past three years. The client says that their cost and quality of work are extremely strong. 

    "They save us about $70 per month." —Business Development Executive, Business Services Company

    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place ,
    5.0
    5.0
    1 Clutch review
  • 21

    Call Experts

    Call Experts is a contact center outsourcing firm headquartered in Charleston, South Carolina. Founded in 1982, they now have over 200 employees distributed between three call centers on the US east coast. Call Experts provides expert services for voice support, including virtual receptionist services, inbound appointments, and customer support.

    Notable Project

    Call Experts provides voice customer support for a mid-size US IT firm. The client was receiving more calls than they could adequately service, and wanted to free up resources to focus on growth. By partnering with Call Experts, they saved hundreds of customer service working hours. As a result, the client has markedly improved the efficiency of their operations.

    "I like the ease of use and reliability of the services. It allows me to communicate with customers in a remarkably more efficient and time saving manner." — Manager, IT Firm

    Former clients
    Charleston Water System
    College of Charleston
    CharlestonGI
    $ $ $ $ $
    equalizer

    Undisclosed

    group50 - 249 Employees
    place Charleston, SC
    4.4
    4.4
    16 Clutch reviews
    Awards

    When Work Works Award

  • 22

    Xplore-Tech

    Xplore-Tech is a BPO company founded in 2004 in Kolkata, India. Xplore-Tech looks to provide voice/call center services, non-voice BPO/back office services, and transcription capabilities to clients in Canada, the U.S., the Philippines, and India. The firm operates with a team of fewer than 10 employees. 

    Notable Project

    Xplore-Tech was hired by an IT company to field its 500,000 inbound calls per day. The partnership began in 1995 and continues to this day. 

    "They have great service and speedy resources." — IT Manager, Technology Company

    $ $ $ $ $
    equalizer $1,000+
    group10 - 49 Employees
    place Kolkata, India
    5.0
    5.0
    1 Clutch review
  • 23

    Complete Call Solutions

    Complete Call Solutions is a voice services outsourcing firm in Omaha, Nebraska. Founded in 2008, they have about 74 employees that serve clients in the retail, hospitality, and financial services sectors. 

    Notable Project

    Complete Call Solutions provides seasonal customer support to an accounting firm around each year's tax filing deadline. Their inbound calls quadruple for a fairly consistent period of weeks around the deadline, and they need additional support to convert on those leads. Complete Call Solutions' services include switchboard, answering, and direct calls.

    "They were excellent. We did train them a bit in what we needed them to do to help our company, and they handled that like pros. Our customers thought they were talking to people who work for us." — HR Manager, Accounting Firm

    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Omaha, NE
    4.5
    4.5
    19 Clutch reviews
  • 24

    Daythree Business Services

    Daythree Business Services is a business service provider in Petaling Jaya, Malaysia. They provide voice services, back office services, and business consulting. They work primarily with midmarket and enterprise companies in transportation, telecommunication, and energy industries. Founded in 2008, they have about 150 employees.

    Notable Project

    Daythree Business Services provided a telemarketing team to support contract negotiations and to contact customers based on targeted campaigns. They provide training, monitoring, and quality assurance. Since the project began, there has been improvement in several areas. They’re engaged and provide qualified agents. They’re cooperative and responsive.

    “[They’re] willing to listen to feedback and reverts with proposals for discussions.” – Head of Telesales, Telecommunication Company

    Former clients
    Teka Singapore
    Quantum Medical Solutions
    $ $ $ $ $
    equalizer

    Undisclosed

    group1,000 - 9,999 Employees
    place Petaling Jaya, Malaysia
    4.0
    4.0
    3 Clutch reviews
  • 25

    ProComm

    ProComm is a teleservice company based in Palo Alto, Calif. Founded in 1991, they have about 50 employees and have clients in the healthcare industry. They specialize in voice and BPO services.

    Notable Project

    ProComm provided answering services and scheduling to a telecommunications firm to increase their customer service, which helped improve the company's efficiency. 

    "They meet our expectations and have even gone above them." — Customer Service Manager, Telecommunications Firm

    $ $ $ $ $
    equalizer $1,000+
    group10 - 49 Employees
    place Palo Alto, CA
    5.0
    5.0
    2 Clutch reviews
  • 26

    Leadroot

    Leadroot is a New York-based lead generation company. Founded in 2017 with an additional office in the Philippines, the small team of less than 10 provides BPO services, voice services, email marketing, direct marketing, and marketing strategy for its small business and midmarket clients. 

    Notable Project

    A legal document automation platform hired Leadroot to refine its marketing strategy and identify its target customers for outreach efforts. They researched and identified target customers, which has resulted in high engagement and conversion rates. 

    "Thanks to Leadroot, and the super targeted leads we’ve been getting, we’re getting 50-60% email open rates and even 10% conversion rates from initial cold-outreach email or call to qualified opportunity. " – Manager, Legal Document Automation Platform

    Former clients
    FatCat
    Woodpecker
    $ $ $ $ $
    equalizer $1,000+
    group2 - 9 Employees
    place New York, NY
    5.0
    5.0
    3 Clutch reviews
  • 27

    PCMSI

    PCMSI is a professional telecommunications agency based in Erie, Pa. The company was founded in 1962 and employs a team of just under 30. They provide a range of voice services for clients in a variety of industries. 

    $ $ $ $ $
    equalizer

    Undisclosed

    group10 - 49 Employees
    place Erie, PA
    2.0
    2.0
    1 Clutch review
  • 28

    Atheva Services

    Atheva Services is an HR company based in Ahmedabad, India with more than 10 employees. Founded in 2020, they specialize in back-office services, HR services, and voice services for small and mid-market firms in the fields of health care and IT.

    Notable Project

    Atheva Services provided outsourcing assistance for a medical recruitment firm. The firm was looking to outsource work for their operations. Atheva Services has helped drastically reduce the firm’s lead times.

    “They’re loyal and hardworking. Go out and visit the team.” - Commercial & Operations Director, Medical Recruitment Firm

    $ $ $ $ $
    equalizer $1,000+
    group10 - 49 Employees
    place Ahmedabad, India
    5.0
    5.0
    1 Clutch review
  • 29

    Cenit Inc

    Cenit Inc is a business solutions provider founded in 2014 with more than 50 members. They offer back-office services, voice services, and web development solutions from their office in Karachi, Pakistan. They primarily work with small and medium-sized companies.

    Notable Project

    Cenit Inc provided backend development services for a SaaS provider. The provider had Cenit Inc manage the orders placed through their chatbot. This has reduced the work that the provider’s team has to deal with on a regular basis.

    “Cenit Inc is always on top of it.” - Enterprise Account Manager, SaaS Provider

    Former clients
    TVape
    $ $ $ $ $
    equalizer $1,000+
    group50 - 249 Employees
    place Karachi, Pakistan
    4.5
    4.5
    3 Clutch reviews
  • 30

    Noida Exim

    Noida Exim Private Limited is a call center outsourcing services provider based in Noida, India. The company, founded in 2009, has more than 250 employees and provides voice services and non-voice BPO/back office services to companies in various industries.

    Notable Project

    A business solutions company hired Noida Exim Private Limited to provide call center services to resolve customer queries quickly. The tech support team that Noida Exim Private Limited provided performed up to the expectations of the company.

    "They offer the good and reliable support team." - Project Manager, Business Solutions Company

    Former clients
    AISIN
    Bangon Udan Enterprise Pvt. Ltd.
    Blueair
    Forever New
    $ $ $ $ $
    equalizer $1,000+
    group250 - 999 Employees
    place NOIDA, India
    5.0
    5.0
    1 Clutch review
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