International Toll-Free Service (ITFS)

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Our Service

Make your company more accessible to your customers, employees, and business associates around the world with Telmex USA’s International Toll-Free Service (ITFS).

ITFS provides toll-free calling capabilities for calls from an international location that terminate in the United States. ITFS calls are dialed by the calling party using an international toll-free phone number or another toll-free number assigned by the foreign carrier. Toll-free services allow calls to be completed to your preferred location without any charge to the calling party.

By advertising a single telephone number in each of our international locations, you’ll make it easy for your in-country customers to contact you—and you’ll also simplify operations and reduce costs.


  • No charge to the calling party
  • Calls are billed to the ITFS owner in the United States
  • Easy access and flexibility
  • Reliable network
  • Local dialing options
  • Wide coverage
  • Clear and simple invoicing


  • Voice services for your company’s locations using our international and domestic networks
  • Calls originate from international locations and terminate in the United States and Puerto Rico
  • ITFS-service commitment on a month-to-month or six-month basis
  • Rates and discount policies are subject to a per-month Minimum Monthly Usage Commitment (MMUC)
  • ITFS subscribers are automatically signed up to Internet billing
  • Available in over 35 countries

Why Telmex USA?

  • Wide coverage
  • We offer two levels of customer support:
    • International support in English, Spanish, and Portuguese from a designated customer care center
      • International assistance center supported by a customer network management center
      • Each care center is supported by a local network operations center (NOC)
    • US Customer Care Center
  • Customer and technical support centers available 24/7, 365 days a year
  • Single point of contact for service orders, implementation, billing options, and more.