Callbox, Martal Group, CIENCE, TeleDirect, Leadium - these are among the top telemarketing companies sales teams rely on to generate qualified leads, increase conversion rates, and build consistent pipelines through targeted outreach and performance-driven communication strategies.
Best Telemarketing Firms
4 Companies-Rankings updated: September 04, 2026
DesignRush evaluates all telemarketing firms based on their expertise, success stories, and verified client reviews. Some listings may be paid.
Founded in 2004 and headquartered in Encino, California, Callbox Inc. is a global leader in outsourced B2B lead generation, appointment setting, and event marketing. With over 20 years of experience and a multilingual team servicing APAC, LATAM, and EMEA, the agency supports medium-sized businesses to...
Top Services:
Managed Services
Cloud Consulting
Digital Marketing
ERP Consulting
CRM Consulting
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Location
Los Angeles, California
Number of Employees
500 - 999
Portfolios Count
100 Projects Listed
Callbox Services
Managed Services
Cloud Consulting
Digital Marketing
ERP Consulting
CRM Consulting
BPO
Event Marketing
SEO
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Amazon
Google
Microsoft
Workday
SAP
Telefonica
Zendesk
opentext
Yandex
NEC
Data sourced from the agency's DesignRush profile
Callbox Reviews & Testimonials
Joachim Fong Regional Marketing Specialist at Malvern Panalytical
5.0★
Lead Generation Review from Joachim Fong
For the past year, Callbox has provided us with satisfactory lead generating and lead nurturing services. They were instrumental in securing attendees for our events, scheduling client appointments and facilitating the sale of one of our benchtop systems. Their professionalism in conveying our product attributes and valued solutions to prospective customers has brought us results.
Jonathan Anderson Owner at ABS
5.0★
Lead Generation Review from Jonathan Anderson
I’ve used Callbox now for about four months for my internet marketing company. The first two months they did not pay off. However with some additional training on my part, they started to close a higher percentage of my target audience. They’re really smart, nice and are really working hard to keep my business. My dedicated team keeps me up-to-date through frequent communications. My R.O.I is getting stronger and my CPA is starting to drop.
Ted Calvin Co-Founder & Vice President at Charted Energy
5.0★
Appointment Setting Review from Ted Calvin
Charted Energy has enjoyed a productive relationship with Callbox. They have done a great job of helping us target prospects within the markets we serve as well as qualify leads and set up appointments with decision-makers. Callbox has generally exceeded the number of leads per week we expected and provides a good value by enabling our inside sales team.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
America's best phone answering service taking care of your callers
Moneypenny is a call center provider that staffs 24/7 answering services and contact center outsourcing for businesses across legal, healthcare, real estate, finance, and home services, with bilingual receptionists, appointment scheduling, call dispatch, and CRM integration included...
Top Services:
Call Centers
Phone Answering Services
Customer Support
Location
Duluth, Georgia
Number of Employees
1000 & Up
Minimal Budget
Under $1,000
Portfolios Count
4 Projects Listed
Moneypenny USA Services
Call Centers
Phone Answering Services
Customer Support
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Critter Control
The Federal Savings Bank
Sterne Kessler
BMW
Keller Williams
The Glass Guru
Eagle Biosciences
Charleston Heating & Air
Data sourced from the agency's DesignRush profile
Moneypenny USA Reviews & Testimonials
Eric Martin Owner at Undisclosed
5.0★
Call Centers Review from Eric Martin
The salesman, Luke?, was very responsive and knowledgeable, a true professional. On boarding with Bailey, was easy and very thorough. Getting on board with an answering service had a lot more detail than I expected and Bailey was very patient and did not rush the process.
Benjamin Rose CEO at Undisclosed
5.0★
Call Centers Review from Benjamin Rose
I needed to get two new numbers set up quickly and Marti Ramirez was able to immediately help me out immediately. Also, Marti had some great suggestions for the scripting that was greatly appreciated. He even went above and beyond to check my multiple other accounts to make sure everything was OK with them. Marti is definitely an employee that goes above and beyond. Thanks again Marti!
Benjamin Rose Founder at Undisclosed
5.0★
Phone Answering Services Review from Benjamin Rose
I needed to get two new numbers set up quickly and Marti Ramirez was able to immediately help me out immediately. Also, Marti had some great suggestions for the scripting that was greatly appreciated. He even went above and beyond to check my multiple other accounts to make sure everything was OK with them. Marti is definitely an employee that goes above and beyond. Thanks again Marti!!
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Brisk Web Services: Your Accelerator in the Digital Race.
Brisk Web Services serves as your accelerator in the digital race, offering tailored strategies, measurable results, and a fervent commitment to driving businesses forward in the online realm. With a focus on delivering customized solutions and tangible outcomes, we are dedicated to propelling our clients to...
Top Services:
Digital Services
Branding
Logo Design
Web Design
WordPress Website Design
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Location
Ćuprija, Serbia
Number of Employees
Under 49
Average Hourly Rate
$10/hr
Minimal Budget
Under $1,000
Brisk Web Services Services
Digital Services
Branding
Logo Design
Web Design
WordPress Website Design
SEO
Business Consulting
Translation Services
Customer Support
Transcription Services
Digital Marketing
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
If speaking kindly to plants helps them grow imagine what speaking kindly to humans can do.
At Customer Umbrella, we pride ourselves on delivering professional, secure, and multilingual customer support services to our clients. With round-the-clock availability, 365 days a year, we ensure that our clients receive exceptional assistance at affordable rates...
Top Services:
Call Centers
BPO
HR Outsourcing
Phone Answering Services
Translation Services
Show more
Location
Varna, Bulgaria
Number of Employees
500 - 999
Minimal Budget
$1,000 - $10,000
Customer Umbrella Services
Call Centers
BPO
HR Outsourcing
Phone Answering Services
Translation Services
Transcription Services
Customer Support
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
5 Frequently Asked Questions About Telemarketing Firms
What do telemarketing companies do?
Telemarketing agencies use phone-based direct marketing to sell products, generate leads, or book appointments on behalf of businesses, performing both outbound and inbound calls to grow sales pipelines and client relationships.
As all telemarketing interactions involve direct human contact, the approach allows them to influence potential customers’ opinions, purchasing habits, or perceptions toward a brand.
What services do telemarketing firms provide?
Telemarketing services for businesses can be split into two main categories: inbound and outbound.
Inbound telemarketing services cover customer support calls, namely technical support, order taking, billing inquiries, upselling, and virtual receptionist service, to name a few. They can support both B2B and B2C companies.
Outbound telemarketing services, also referred to as proactive outreach, are intended to boost businesses’ bottom line. This category comprises several different service types, including lead qualification, appointment setting, cold calling, customer reactivation, and more.
B2B telemarketing companies are often hired to assist non-profit organizations in soliciting donations or to collect debt and follow up on overdue accounts on behalf of other businesses.
How much do telemarketing agencies charge for their services?
Telemarketing agencies charge between $7 and $75 per hour for their services. The service cost can also vary based on location (offshore vs. onshore), campaign complexity, duration, and agent experience, with B2B telemarketing campaigns often costing more than B2C.
Other common pricing models include:
Per-lead: $35 to $60 per qualified lead
Flat-rate: $650+ for a 4-week campaign
Commission-based: 5% to 20% of each closed sale
How long do telemarketing campaigns take?
Telemarketing campaigns usually take a few months, as lead nurturing takes multiple phone calls for telemarketers to engage with a prospect and close a sale.
Although initial lead generation begins within the first few weeks, for a full, effective cycle, the campaigns are run between 3 and 6 months. The average campaign takes about 14 weeks to reach an optimum level of opportunities per day. The length also depends on the campaign type:
Pilot and trial campaigns: Usually run for 10 to 12 weeks to test the market, refine the pitch, and validate traction.
Short campaigns: 4 to 6 weeks for time-sensitive promotions or event registrations.
Long-term campaigns: 6 months to over a year for slow B2B sales cycles that require more lead nurturing.
What kind of ROI can businesses expect from telemarketing campaigns?
Lucrative telemarketing campaigns often result in a 5:1 to 10:1 return on investment (ROI), meaning $5 to $10 in revenue for every $1 spent. The return rate depends on the quality of the call lists, the persuasion skill of the callers, the product, the offer, and whether it's part of a multi-channel strategy. Notably, ROI grows over time through stronger customer retention and better targeting informed by feedback from calls.
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