MX 308 do not give the fax receive tone

You are doing it in the wrong order.

Press FAX. Load your document/s. Dial the number and press black start. It will take up to ten pages automatically That's it.

Hello.
You have explained your question with very good detail
Press the colour button, then hang up. Most faxes are capable of transmitting colour faxes, and you should press the colour because even if the sender sends a B&W Fax, it will Automatically receive it in B&W. If they send a colour fax and you hit the B&W Button, it will only receive in B&W.
I hope this helps, if so please rate this answer below Thank You for supporting the FixYa Community
Regards GM

Step by step information at the link below.
Brother Fax T96
The F/T Mode is used to allow the fax machine and the telephones to share the same telephone line. When a call comes in, the fax machine and all extension telephones on that line will ring according to the number of rings you have set for the Ring Delay.
When the Ring Delay is completed, the fax machine will answer the call and determine if it is a fax call or a telephone (voice) call.
The fax machine can determine this by the signal it is receiving on the telephone line. If someone is sending a fax automatically , the sending fax machine will transmit a fax tone (a series of beeps every 3 seconds).
If your fax machine hears these tones, it will receive the fax.

If the fax machine does not hear any fax tones, it assumes it is a telephone (voice) call and will begin ringing the F/T ring tones (double ring) for the length of time you selected for the F/T Ring Time. These tones will only ring on the fax machine's handset (extension or external phones will not ring). At the end of the F/T ring time the fax machine will go into the receive mode in order to receive a manual fax.
(If the call was a voice call and was not answered, the caller will hear the fax receive tones also).

• If you answer the call before the fax machine(during the ring delay period) and determine it is a fax, you can transfer the fax to the fax machine for receiving.
  
  
• If you answer the call on an "extension" phone and hear a beep every 3 seconds (automatic fax) or silence (manual fax), press *51 or *91 for New Zealand (remote activation code) on the telephone keypad, wait to hear the fax machine turn on (chirping sounds) and then hang up.
  
  
• If you answer on the handset of the fax machine and hear a beep every 3 seconds or silence, press the Fax Start or Start/Copy key on the control panel of the fax machine and then hang up the handset.
  
  
• If you answer a call on an "extension" phone during the F/T Ring Time, you will hear the F/T ring tones.
  To release the call from the fax machine, press #51 or #91 for New Zealand (remote deactivation code) on the telephone keypad and you can speak to the calling party.
  
  
• If you pick up the handset of the fax machine during the F/T ring time, you may talk to the calling party immediately.

Hi!

It is very easy

To Send Fax:
1. Place the documents facing down in the flatbed scanner glass or insert in the ADF unit with the documents facing up.
2. Press the Fax button
3. Key in the number of the receiver then press the black or color START button.
4. Listen to the dial tone and see in the lcd display the message "transmitted" to confirm that the documnets have been sent.
Using the phone is attached to your printer (documents is already load to the printer)
1. Call the number of the receiver.
2. Ask for a fax tone.
3. Once you heard the fax tone, press the Black or Color Start button

To Receive Fax (Set up first the number of calls before automatic giving fax tone to caller)
1. When someone is trying to send a fax to you, don't answer the ring on the phone, let the printer give the fax tone.
To receive the fax on the printer with the user's help.
1. When someone is calling, just press the Black or Color Start button.
To receive fax when you answer a phone
1. While the phone is lift up, press the Black or Color Start button to receive the fax.

Hope that information will guide you.
You can thank me by just rating this help.
Thank you for using Fixya.

The receiving party will have to press START when they hear fax tones.

that's right,you would be able to send fax,but wont be able to hear the fax tone,your fax ring shoud be 2 rings higher than answering machine,or else,do 1 thing when you hear the ring,just pick up the receiver u wud be able to hear the fax tone,do not disconnect the call,just keep the receiver aside without disconnecting,and then press start fax...you will be able to receive fax...........

It does not sound as if there is a problem with your machine. The receiving parties may have given you the wrong number to send to.

Call those numbers from a regular phone and listen for fax tones.

Does the receiving or sending party have a DSL phone line?

There is no setting to make this work, sorry.

This is just the nature of digital phone service. Some fax machines will work, and some won't, but generally the extremely high priced units are the one that will work (of course, right?)

It all has to do with the way the fax machine "hears" the ring, or detects the dial tone.

The only other option is to use the HP as a scanner, and send the faxes through the internet using a 3rd party fax program.

I know this is a pain, but unless you want to shell out big bucks for a new fax machine, it may be the only answer.

enter rx settings and select teleline as fax priority.