I wish to set up a single telephone line for faxes & voice calls -voice calls more frequently. The quick start guide refers to the "User's Guide on-screen manual. What is that?

For more details on how to setup your Lexmark X4650 printer for faxing, please refer to the User's Guide found on the Lexmark website.
Additional info:If you have an answering on the same line as your fax:

To make sure the printer picks up incoming faxes, set Auto Answer to On, and then set the printer to pick up after a greater number of rings than the answering machine. For example, if the answering machine picks up calls after four rings, then set the printer to pick up after six rings. This way, the answering machine picks up calls first and your voice calls are received. If the call is a fax, then the printer detects the fax signal on the line and takes over the call.

If you have a voicemail feature associated in the same line as your fax:

Voice mail and fax can share the same telephone line if you subscribe to a distinctive ring service offered by your telephone company. This feature allows you to have multiple telephone numbers on one telephone line. Each telephone number has a designated ring pattern (single ring, double ring, triple ring, or double and triple ring). The different ring patterns let you know which telephone number was dialed, and which device you should use to answer the call.

If you do not have distinctive ring service, then set the printer to receive faxes manually (Auto Answer Off). This setting lets you receive both voice calls and fax calls, but works best if you use voice mail more often. You need to turn off voice mail whenever you are expecting a fax.

leave these phones unused for one day and then use it and see.

leaving them unused will make everything get settled.

Try resetting the machine to it's defualt settings.

If you have an answering machine connected to the same line as your fax:

To make sure the printer picks up incoming faxes, set Auto Answer to On, and then set the printer to pick up after a greater number of rings than the answering machine. For example, if the answering machine picks up calls after four rings, then set the printer to pick up after six rings. This way, the answering machine picks up calls first and your voice calls are received. If the call is a fax, then the printer detects the fax signal on the line and takes over the call.

If you have a voicemail feature associated to the same line as your fax:

Voice mail and fax can share the same telephone line if you subscribe to a distinctive ring service offered by your telephone company. This feature allows you to have multiple telephone numbers on one telephone line. Each telephone number has a designated ring pattern (single ring, double ring, triple ring, or double and triple ring). The different ring patterns let you know which telephone number was dialed, and which device you should use to answer the call.

If you do not have distinctive ring service, then set the printer to receive faxes manually (Auto Answer Off). This setting lets you receive both voice calls and fax calls, but works best if you use voice mail more often. You need to turn off voice mail whenever you are expecting a fax.

I hope this helps.

Should you need further assistance, please contact Lexmark Technical Support Center.

Distinctive Ring basicsDistinctive Ring service is an optional service available from many telephone companies. The Distinctive Ring service permits you to assign more than one telephone number to the same telephone line. Distinctive Ring allows you to use a single phone line for both voice and fax calls. You can assign a unique phone number and ring pattern for incoming fax calls. When a fax comes in, each telephone number makes a distinctive ringing sound, such as a single ring, double ring, or triple ring.
NOTE: The Distinctive Ring Service is the name HP and others use to describe this feature. Distinctive Ring is also known as:

• Call Sign
• Custom Ring
• Ident-a-Call
• Ident-a-Ring
• Ident-a-Ring
• Multi Ring
• Personalized Ringing
• Ringmaster
• Smart Ring
• Teen-Ring

The Distinctive Ring Service allows the HP product to work similarly to a dedicated fax line. If you connect an HP fax product and a telephone to one telephone line, you can assign one telephone number for fax calls and another for voice calls.
NOTE: You cannot send or receive faxes when the phone line is in use. Even if the HP fax product has a separate telephone number, it is still sharing the same phone line. Set the Distinctive Ring Service Using the menus on the product control panel, follow these steps to set a distinctive ring pattern. Step one: Turn on Auto Answer Turn on Auto Answer by pressing the Auto Answer button on the control panel. The button light indicates when Auto Answer is on.If the button light is already on, you do not need to press the button. Step two: Set the distinctive ring patternFollow these steps to change the answer ring pattern.

1. Press the Setup button ( ) on the product control panel.
2. Press the Right Arrow button ( ) to select Advanced Fax Setup , and then press the OK button.
3. Press the Right Arrow button ( ) to select Distinctive Ring , and then press the OK button.
4. Press the Right Arrow button ( ) to select one of the following options:
   • All Rings
   • Single Rings
   • Double Rings
   • Triple Rings
   • Double & Triple Rings
5. Press the OK button to select the option.
6. Press the Back button ( ) to return to the main menu.

Now if you have anymore problems copy the link from below and paste it in your address bar and it will help you further with a document. Follow all the settings in the document and your fax should be setup,keep in MIND THAT THE RINGS TO ANSWER SHOULD BE 2,SO YOU CAN RECEIVE FAXES AFTER TWO RINGS

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01647469&tmp_task=solveCategory&lc=en&dlc=en&cc=us&lang=en&product=3795406

Are you using DSL connection or Dial-up?
What OS are you using?

The fax line and voice line are using the same frequency so you should be able to fax directly from your pc fax modem when using Dial up connection but in DSL the data and voice are using different frequency. So in normal situations you wont be able to fax using DSL modem unless you use a separate fax machine.

However, if specified during the set-up of the DSL line, the signal can be separated so that some of the bandwidth is used to transmit an analog signal (for voice and fax) while the remaining bandwidth is used to transmit digital data. This allows for the use of the telephone or fax, and computer on the same line and at the same time. When inquiring about DSL with the service provider, specify the desire to use the phone line for voice or fax calls while connected through the computer to the Internet.

Reference the following setup options for using a DSL line with HP all-in-one or fax products.

Please refer to my solutions to your issue at http://www.fixya.com/support/t1440518-want_able_fax_from_computer_even_though

PLEASE RATE MY SOLUTION.

Receive Mode Settings Select from the following receive mode options to suit your needs. Once you've decided on which receive mode to use, follow the below instructions to set the receive mode using the operation panel. Receive Mode Setting

1. Press the <FAX> button to enter Fax mode.
   
2. Press <Menu>.
   
3. Press the right or left arrow button to select [Receive mode settings], then press the <OK> button.
   
4. Press the up or down arrow to select the receive mode that best suits your needs, then press <OK>.
   
   

Types of receive mode
Select the receive mode according to your needs.
Receive mode
Purpose
FAX/TEL AUTO SW When you want to receive faxes automatically as well as voice calls. FAX ONLY MODE When you want to receive only faxes automatically with your machine, or have a dedicated telephone line for FAX use only. DRPD When you have subscribed to a DRPD service with your telephone company. MANUAL MODE When you receive mainly voice calls and sometimes faxes, or want to receive faxes manually. ANS.MACHINE MODE When you want to receive voice messages on your answering machine and receive faxes automatically. FAX/TEL auto switch
FAX :
The machine does not ring but will receive the fax automatically. Voice call :
The phone attached to the machine will ring. Pick up the handset to answer the call. Note:

• Ring start timing and Telephone ring length can be specified in FAX/TEL auto switch in the Receive mode settings.
  
• If you want the telephone to ring when it receives a fax, connect a telephone to your machine and enable the Incoming ring settings in RX settings.
  
• The phone attached to the machine may not ring depending on the telephone type you are using.

FAX only
FAX * :
The telephone does not ring. The machine will receive the fax automatically. Voice call :
You will not be able to answer the call. * If you want the telephone to ring, connect the telephone to your machine and enable the Incoming ring settings in RX settings menu.


DRPD
FAX :
Your telephone line will ring according to the ring pattern you have chosen and receive the fax automatically. Voice call :
Your telephone line will ring according to the ring pattern you have chosen. Pick up the handset to answer the call. Note: Specify the FAX pattern in the DRPD: Set FAX ring pat. in RX settings menu.

Manual RX
FAX :
The telephone attached to the machine will ring. Pick up the handset and if you hear a beep tone, press the <Color> or <Black> button on the machine to receive the fax. Voice call :
The telephone attached to the machine will ring. Pick up the handset to answer the call. Note: If you are far from your machine, you can use the remote receiving function to receive faxes. Pick up the handset of the telephone connected to the machine and press 25 (the remote receiving ID).

Ans. machine connect
FAX :
First the answering machine connected to your machine will respond to an incoming call, and then the machine will receive faxes automatically. Voice call :
The answering machine connected to your machine will respond to an incoming call. Note:

• Set the answering machine to answer on the first or second ring.
  
• The entire message should be no longer than 15
  

Two items you need to do. Press user tools and go to fax settings from there you need to turn of auto fax reception and change to manual. (keep in mind, that when a fax comes in, meaning you pick up the phone and hear the fax tone, you will need to press the green start button to activate the fax sequence).

Also make sure you telephone is plugged into TEL and phone line into FAX/

www.mfpsolutions.blogspot.com

Slim1234,
          A multitude of problems might cause receive problems, and the User's Guide has no "receive Problems" section under troubleshooting - so here goes:

        If I had to guess right off the bat, your problem is probably
that the FAX is in "FAX Storage" mode, and is out of memory.
In this mode, it will print FAXes until it runs out of memory.
See problem "g" below.

   a. Voice mail active on the line - if voice mail and FAX-2820 are
       set to answer the line on the same number of rings, there's
       no way to know which will answer first.

   b. Voice mail active on line - if voice mail is set to answer in
       fewer rings than the FAX, then the FAX will always lose
       (but you'll have no problems Xmitting).

   c. Call Waiting active on the line - the call waiting "boop" will
       kill incoming FAXes (and outgoing FAXes too, but your
       personnel will retry the outging ones until they succeed
       and you may only hear complaints about incoming FAXes).

   d. Your FAX-2820 is set to "Manual" or "External TAD" mode.
       Reset it to "FAX only" or "FAX/Tel" mode (depending on
       your office use of the FAX telephone line).
       How to do this: Menu/Set,0,1 <up/down to select mode>
                              press Menu/Set.
   NOTE: your LCD display tells you your receive mode:
       Mine says "Sleep 22:08 Fax", telling me I'm in "FAX only"
       mode, and its 10:08 PM.

   e. You've set the FAX to RING DELAY - if so, the FAX
       must win. Setting ring delay to 00 tells the FAX to answer
       the line silently (an advantage for a busy MD's office).
       How to change this: Menu/Set,2,1,1
       Ref: FAX-2820 User's Guide p.4-2

   f. You dont have a shared (FAX/human) line set to
     "Easy Receive"; if someone answers the call and
      Easy Receive is off, then they need to press START on
      the fax machine front panel or dial *51 and hang up.
      How to change it: Menu/Set,2,1,3
      REF: Fax-2820 User's Guide p. 4-2

  g. You may be set up for "FAX storage."  In this mode, received
      FAXes will be stored (and printed) until you run out of
      memory (quickly done on a Brother FAX-2820), then you
      get nada (but sending FAXes still works).
      How to reset this: Menu/Set,2,5,1 <up/down>
      REF: Fax-2820 User's Guide p.6-2

  h. You may have set up FAX forwarding.  In this mode, sending
      FAXes will work fine, but all incoming FAXes willl be sent
      to another telephone number.
      How to turn it off: Menu/Set,2,5,1 <up/down>

      If this laundry list of (sending OK, Receiving dead) scenarios
 doesn't resolve the problem, email your FAX number to me
and we'll do some cross-country FAX debugging.

                                  Dave in tech support
                                  [email protected]
P.S.
      The above features may have been set remotely by a
   nefarious (or somewhat knowledgeable) individual - remember
   that a little knowledge is a dangerous thing (even for
   FAXes). See (extensive) remote programming instructions
   on p.6-6 of the User's Manual.

        To print out the caller ID list - and possibly find out the
   source of the remote programming:
   Menu/Set,2,0,3 <up/down to "print report">, Menu/Set,
    Start, <Caller ID report prints>, Stop/Exit
   Ref: Brother Fax-2820 User's Guide p.A-3

sure u can: Installation with an answering machine and/or extension telephone: 1. Remove the seal covering the TEL. SET jack on the rear of the fax. Connect an extension telephone or answering machine to the TEL. SET jack. 2. If desired, connect an extension phone to the answering machine. from the user Fax guide: If desired,you can also connect an answering machine or an extension telephone to your fax. ¨ Connecting an answering machine to the fax will allow you to receive both voice and fax messages on the same line while you are out. For details on using this feature, see Chapter 7. (Note: Do not connect an answering machine to your fax if you will be using the distinctive ring feature described in Chapter 2.) ¨ You can connect an extension phone to the fax to make and receive calls like any other extension phone on your line.