FAQ - Fax - Sending Internet Faxes

How do I start sending Internet faxes?

First, make sure you have an active OneSuite account with a sufficient balance.

Next, you can choose one, or use both of OneSuite's fax sending platforms, depending on your needs:

  • When you are using a Mac, PC or Linux, and you are away from your personal computer, use OneSuite WebFax. All you need is a computer with Internet access and you are good to go!

    Get started with OneSuite WebFax.

  • When you are using a PC and want to create customized coversheets, you will need to download OSFX driver after you subscribe to OneSuite Fax Plus.

    Get started with OSFX driver.

Do I need special programs to send faxes?

For our browser-based OneSuite WebFax, you do not need to download any programs. Just log in to your OneSuite account to start sending faxes via the internet.

For our OSFX driver with more customizable features, you will need to download and install OSFX driver on your Windows PC after you subscribe to OneSuite Fax Plus.

What is OneSuite WebFax?

It’s our browser-based, Mac and Windows friendly, Internet fax sending solution, so you can send faxes from anywhere in the world, as long as your have Internet connectivity, and access your contact list on the go, even when you are away from your own personal computer.

Start sending web faxes by logging into your OneSuite account, on the left menu, go to OS Fax, and click on option "Send Web Fax."

What is OSFX Driver?

OSFX is an Internet fax software that offers the freedom and convenience of sending fax from your Windows desktop computer or PC. For more technical or setup details, please go to the Sending General or Troubleshoot section.

If you are a OneSuite Fax Plus user, you may register up to 5 fax-to-email addresses with each fax number. Update your email information on My OneSuite Fax Features page.

What is the difference between OneSuite WebFax and OSFX driver?

See the side-by-side comparison to find out which option is best for you. As a OneSuite Fax Plus subscriber, you have access to both options, and can always switch over depending on your needs.

OneSuite Fax Basic
OneSuite Fax Plus
Using OSFX Driver  
Subscription fee
Set-up charge
Fax number
Inbound fax
            Fax-to-email address
            Additional fax number
Outbound fax
            Works on
Any email client, computer or  smartphone
Web-based for Mac,
PC, Linux
            Document Types
MS Windows docs, pdf, jpeg.
See complete list
MS Windows docs, pdf, png, jpeg.
See complete list
            Preview fax
            Delivery confirmation
            Customizable cover page
            Broadcast fax
            Fax history
Up to 90 days
            Automatic re-send
            Phone book
            Consistent low rates
* Existing OneSuite Fax Basic customers may upgrade to OneSuite Fax Plus at My Account.


How do I know if I have sent a fax successfully?

When you send a fax, you will receive a delivery confirmation email from "OneSuite Fax" in your registered email. A copy of the fax message will be attached as a .pdf file to the email notification.

Can I change the delivery confirmation email address?

Yes. By default, delivery confirmation of successful and failed faxes is sent to your OneSuite registered email address. However, you may change the forwarding email address on My OneSuite Fax Plus page under My Account.

Can I turn off delivery confirmation feature?

Yes. You may turn off the feature anytime. Please go to My OneSuite Fax Features page under My Account.

What is the largest fax size for outbound fax?

OneSuite Fax allows for 100 pages at a time. However, transmission may be canceled if submission is not completed within 180 minutes.

Why is the transmission canceled?

The transmission will be canceled if the file submission is not completed within 180 minutes.

Can I send a fax to multiple recipients or fax broadcasting?

Yes. This feature is called “broadcast fax.” With OneSuite Fax Plus, you may simultaneously send a fax to multiple recipients.

For OneSuite WebFax users, please refer to the OneSuite WebFax help section "Creating and Sending a Fax" then choose "Adding One or More Recipients to a Fax."

For OSFX driver users, please refer to "Phone book groups" under "Managing your contacts" section in OSFX help guide.

How do I enter an international fax number?

Enter the number just like making an international call from U.S. or Canada. Dial 011 + country code + area code + phone number.

Do you re-send failed faxes automatically?

Yes. With OneSuite Fax Plus, failed faxes are automatically resent with 3 attempts, with every attempt taking place every 5 minutes. Note that only the failed fax pages will be resent. For example, in a case where a transmission of a 20-page fax fails on the 15th page, OneSuite Fax Plus automatically resends the 15th and the following pages.

What file types are supported by OneSuite WebFax outbound fax?

The following attachment file types are supported by OneSuite WebFax (reminder: please make sure your document is formatted within margin to ensure the recipient’s fax machine will print properly):


Microsoft Office
Text Documents

Microsoft Internet Explorer
Open Office
Other Document Types
What file types are supported by OSFX Driver outbound fax?

The following attachment file types are supported by OSFX driver (reminder: please make sure your document is formatted within margin to ensure the recipient’s fax machine will print properly):

Adobe PDF
Encapsulated PostScript (EPS)
Lotus Word Pro
PC Paintbrush (PCX)
Enhanced Metafile (EMF)
Portable Network Graphics (PNG)

Microsoft Excel
Microsoft PowerPoint
JPEG File Interchange Format
Microsoft RTF
Lotus 1-2-3
Lotus AMI Pro
Microsoft Visio
Lotus AMI Professional Write Plus
Microsoft Windows Bitmap (BMP)
Microsoft Word


Note: Supported file types vary with every PC, depending on the programs installed in your computer. The general rule is, any printable documents can be attachments. To check if a specific file type is supported, go to Windows Explorer > Tools > Folder Options > File Types and choose the extension of the file (e.g. XLS). Click on the 'Advance' tab. If “Print to” is listed, it means the file with that specific extension can be sent.

How am I billed for sending OneSuite faxes?

Each Internet fax page is billed by its transmission duration, in 1-minute increments. It is generally assumed 1 page = 1 minute; duration may be affected by the baud rate of the receiving fax machine, line quality, or graphic intensity of the document.