Use of the IFT telephone system

1 Calling long distance in Brazil

1.1 Carrier prefices


12 - CTBC

14 - Brasil Telecom

15 - Telefónica

21 - Embratel

23 - Intelig

25 - GVT

31 - Oi

41 - TIM

1.2 How to dial

If you are going to make a long distance call to another geographic area code you have to dial:

0 + carrier prefix + geographical prefix + 8-digit phone number

Example: If you calling telephone number 1234-5678 in São Paulo this would typically be written (11) 1234-5678, but in fact you have to dial 0 31 11 1234 5678 where 31 means that you want to use Oi as a carrier.

To make international calls you should follow the same procedure. You have to dial:

00 + carrier prefix + country code + phone number. Note the double zero in the beginning of the number

Example: Suppose you are calling telephone number 12131415 in Norway. This would typically be written in the format +47 12131415 but you have to dial 00 31 47 12131415 (if you use Oi as your carrier).

2 Calling rules

xxxx-xxxx or 9xxxx-xxxx inside SP:

just call 8-digit number no extension no 011

xx-xxxx-xxxx (long distance)

call 0xx-xxxx-xxxx


call literally 0800-xxx-xxxx, ignore the error messages


there is a secret code which Vilma knows, the IFT will pay

You have to dial fast; a delay in 2-3 seconds between button presses may lead to disconnection.

This makes dialing very inconvenient.

3 Automated dialing

Fortunately, there is a way to dial automatically, or at least almost automatically.

First, have to determine the IP of the telephone, by pressing the Setup Key and navigating to Network. You find something like this: (just an example)

Now suppose you want to call 38384000 (FAPESP). With the handset on-hook, send a POST request to requesting the URL /, with the following parameters:

"28078" → "38384000"

This sets SPEED DIAL No 2 to this number: 38384000

Now (with the handset still on-hook!) press 2. Then lift the handset. The telephone will start dialing FAPESP.

Sample script is available here.

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