How to Setup Faxmail

Best Efforts: If you rely on faxes as part of an emergency service or alternately have a business process dependent on a physical fax machine (for sending or receipt) we recommend retaining your legacy PSTN fax service.


Our vFax service is designed to replace your old fax machine with vFax number that leverages email for both receipt and delivery of all faxes. Using our vFax service you can easily control whom can send and receive incoming faxes, discard junk and importantly you’ll never need another roll of fax paper.

  • Supported document types:Potrait A4 or smaller PDF, JPEG, Postscript and Tiff attachment formats (sorry no MS Word docs)
  • Sending: [number] (eg
  • Confirmation: We will send the approved sender a confirmation (see image below).

Quick Guide – Configuring your vFax

Step 1: Fax Delivery Options

  1. Log into Your2talk Cloud PBX.
  2. Select 2talk Cloud PBX | select Fax hyperlink  line number
  3. Faxmail Delivery Options | whom you want to receive incoming faxes
  4. Click Save settings.

Step 2: Fax Sending Options

  1. Click Faxmail Sending Options
  2. Add and Optional fax verification phase. Specify the alternate fax number/phase in the email Subject field and the Faxmail server will present the specified Subject field fax number as your outgoing fax number. Call it CLI masking for faxing.
  3. Click Save settings to update.

Step 3: Do Not Disturb for Fax

  1. Click Dot Not Disturb for Fax
  2. Click Enable Do not Disturb for Fax Service
  3. OR Click Play a busy tone instead of diverting the caller to Faxmail, By default the fax would be delivered as an email attachment to the assigned email in the delivery option page of faxmail.
  4. Click Save settings to update.

Other Sending features

vFax and T.38

When a traditional fax is sent (or received) over the PSTN, the recipient machine expects to receive nothing less than100% of the data of the originating fax. The problem for VoIP faxing is contending with data (or packet loss) caused by network congestion on the public internet. While typical uses such as email, web browsing or even VoIP phone calls by design can handle some packet loss, traditional faxing will fail on anything less than 100%,  which is where the T.38 fax protocol comes in by attempting to remove packet loss by using our fax gateway as an intermediary to keep retransmitting until all data is sent or received.

To further improve reliability we decrease the transmit speeds down to 9600 baud which not only improves reliability but is universally supported by all recipient machines. The slight down side is a decrease in delivery speeds with an average single page fax taking between 60-90 seconds.

Porting in your legacy fax number

If you’re porting a fax number from another service you will need to ask us to convert that number into a T.38 fax line by raising a support ticket ( There’s no cost and it only takes a few minutes for us to convert the number.

Known issues

  • Machine to machine: Our service is designed to replace your fax machine using your email to send to our fax gateway which in turn sends to our fax gateway for delivery. Where customers send directly between two fax machines they effectively side step our fax mail gateway as the intermediary. In this scenario we loose the resilience of our fax gateway’s send / receive retry buffering.
  • Dual answer / fax mode: Where the fax machines auto answer the call our fax gateways interprets this as a traditional voice call and will hangup.
  • High speed fax machines: One technique a t.38 fax gateway deploys to increase reliability is to instruct the recipient machine to adjust its speed (or baud rate) down to the slowest speed of 9600. Machines without the ability to auto adjust have a much higher probability of packet loss and ultimately fax failures.
  • Color fax machines: Similar to the problem with high speed machines, we cannot receive color faxes.
  • International faxing: Because of the inherent latency and packet loss associated with transmitting IP data internationally, we do not recommend this service for international faxing.

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