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I have an MX870 with the same problem - fax picks up during a voice call
and I can no longer hear the caller. As with everyone else, the
problem is intermittent and not replicable. I have tried tel priority
mode and fax priority mode (from the phone/paper submenu under physical
Fax button) and all the various RX receive setting under Fax Settings
submenu of the physical Settings button.
But I have a new possible solution. I only use the fax for outgoing -- for some time now I have been using K7.net
for incoming faxes which delivers faxes to my email. That way I have a
dedicated fax number, never miss an incoming fax while on the phone,
and I have all faxes in electronic form as well.
So, my new idea was to set the MX870 to DRPD (distinctive ring pattern)
receive mode (from the phone/paper submenu under physical Fax button).
Since my phone service through Xfinity/Comcast does not offer DRPD, I am
hoping that the MX870 will NEVER pick up a fax.
I will keep you posted as to whether this works.
Plug in the RJ-11 cable at the phone jack and the MX340. Press the Fax button and then the Menu button to get the Fax Settings menu. Press the left/right arrows to highlight Fax Receive Mode. Then press OK. Select Telephone Priority Mode (you will always pick up the handset and then put it down if the call is a fax. If an answering machine is connected the Fax will be automatically answered), Fax Priority Mode (the fax will be automatically received. If you hear the machine's ringtone, pick up the handset and press Stop to answer the call.), Fax only or DRPD (distinctive ring - available extra from your telephone company). Press OK to save the setting. If you choose DRPD, you will need to teach the distinctive ring by calling the MX340 after setting the machine to listen to the ring. (See the manual.) To fax out, press Fax, put your item to fax face up in the ADF and then dial the fax number of your receipient.
It will only automatically pick up the line when set to "fax". You need to subscribe to a "distinctive" ring (which is a double ring) service through your telephone company and set the rings to answer appropriately so as to not conflict with your voicemail
This is a known problem with the MX850 - Canon thinks it works, but it needs to be FAX Only when you're out of the office and TEL PRIORITY when you're in the office - then you hit "Hook" when you hear an incoming call as a fax tone. It's a manual answer machine when in TELEPHONE Priority
Have you tried telling the printer that it is to be used as "telephone priority" Press the "fax" button on printer, then "menu" button Use the left or right arrow keys to key across to "Receive mode settings" then press OK Use the up or down keys to select receive mode. You should make sure it is in "telephone priority" then press OK
Do you have the phone you are answering with connected through the fax machine? If you have the machine set in 'tel priority' mode, the machine will not begin receiving a fax until you press 'FAX' and the 'color' or 'black' button. Alternatively, if you have your phone connected to the 'telephone' jack on the machine (next to the 'L' jack), you can press '2' and '5' on the telephone keypad to turn the machine on in fax receive mode.
In the menu:
Telephone Priority Mode will work. Also, set RING COUNT in RX SETTINGS under FAX SETTINGS to allow an answer machine to pick up the phone first.
Also, you can ask your Telephone Co. for a distintive ring on you line, this will tell the unit that a fax is coming in. AT&T calls it the service "RingMaster"
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I think I know why. You need to set the proper priority of your all-in-one Canon device. If it is TEL priority, it means you need to have a phone connected to the fax. If the phone rings, you need to pick up the handset and check if it's a fax tone or a call. If it is fax tone, you wait for 5 secs til fax tone stops, and then hang up. After that you will receive the fax. Failure to pick up the handset will not allow you to receive the fax. This might be the most probable setting you have, hence you can't receive the fax. If it is FAX priority, the same thing happens as TEL priority. Only difference is if you don't pick up, and it is a fax, it will still receive. You can also do FAX only. No need to connect a phone. Device will receive automatically.