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HP Officejet Pro L7680 All-in-One Printer support

Using the Fax with a Telephone Answering Machine (TAM)

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Introduction

HP all-in-ones are designed to work with a telephone answering machine (TAM) on phone lines that receive both voice and fax calls. A telephone answering machine is not a voice mail service; a telephone answering machine is a physical device that can be setup following the guidelines below.
NOTE:If there is voice mail, call waiting, or billing tone installed on the telephone system, disable these features since they can interrupt fax communication.
HP products are designed to work with a telephone answering machine. HP cannot guarantee that all brands and types of telephone answering machines will work with the All-In-One fax product. Below are guidelines and recommendations to setup and configure a telephone answering machine with the fax.

Setting up a telephone answering machine

  • Verify that Auto Answer is enabled (the Auto Answer indicator light will be on).
  • Set the Rings-to-Answer setting on the fax to a number that is at least two greater than the telephone answering machine setting. For example, if the telephone answering machine is set to answer on four rings, set the fax to answer on six rings.
  • Verify that the Answer Ring Pattern setting is set to ALL RINGS.
  • When recording the outgoing message (OGM) on the telephone answering machine, the voice portion should be at least 10 seconds long, but no longer than 20 seconds. Record 5 to 7 seconds of silence at the end of the voice portion of the outgoing message. The total outgoing message length would be the voice message plus the additional 5 to 7 seconds of recorded silence. Consult the manufacturer's manual for specific instructions on recording and re-recording messages.
  • Make sure to record the OGM with minimal or no background noise as this can cause interference when the fax is eavesdropping on the telephone answering machine.

How the fax works with an answering machine

  1. When a call comes in, the telephone answering machine and fax will ring. The front panel displays Ringing .
    If the fax does not display Ringing on the front panel, then eavesdropping from the answering machine will never be possible. Follow this link to change the Ring detection Frequency .
  2. The answering machine must answer the call before the fax answers the call. Adjust the Rings-to-Answer settings on the telephone answering machine and all-in-one if necessary. Once the line has been picked up by the answering machine, the front panel of the fax will display Phone off Hook . The outgoing message begins to play and the fax listens (eavesdrops) on the line for fax calling (CNG) tones from another fax machine.
  3. If CNG tones are detected, the fax will take over the call from the telephone answering machine. The front panel displays Connecting . If tones are not detected, the telephone answering machine will record the message.
    NOTE:If a person answers an incoming fax call (CNG tones will be present), wait for the fax to react to the CNG tones, then hang up the phone. This will work only if auto answer is turned on.

Problems when using a telephone answering machine

Fax is not ringing when a call is incoming or ringing is not displayed on the fax

  • When a fax call comes in, the fax display should indicate Ringing and then change to Phone-Off-hook after the answering machine picks up the line. This display change may take several seconds on the fax. If the fax cannot detect a ring signal, then it will not eavesdrop on the phone line when the telephone answering machine answers. So having the correct answer ring pattern setting is important as is getting a proper ring signal from the phone company or PBX. However if the answer ring pattern is correctly set (set to ALL RINGS by default), and the fax is still unable to detect a ring, then contact the phone service provider for help.
  • Using extra telephone splitters, telephone extension cables, and/or not using the original HP telephone cable supplied with the unit may cause a decrease in ring signals. Disconnect all of these peripherals and use the fax cable supplied with the unit to receive a fax.

Fax is not responding to Fax Calling Tones (CNG)

  • If the fax cannot detect fax calling tones, there may be too many devices (phone equipment or splitters) sharing the phone line. Remove all equipment (except the telephone answering machine, and filters if on ADSL) so that the ONLY TWO devices on the wall jack are the telephone answering machine and the fax.
  • The fax will eavesdrop for fax calling tones when the display indicates Phone Off-Hook . Adjust the outgoing message (OGM) on the telephone answering machine to allow for the fax calling tones to be detected by the fax (requires at least 7 seconds). The voice portion of the outgoing message should be at least 10 seconds long, but no longer than 20 seconds. Record 5 to 7 seconds of silence at the end of the voice portion of the outgoing message (total outgoing message length would be the voice message plus the additional 5 to 7 seconds of recorded silence). This can provide enough silent time for the fax to detect fax tones.
  • The Ring Equivalency Number (REN) is useful to determine the quantity of devices allowable to connect to a telephone line and still have all devices ring when the number is called. Too many devices on one line may result in failure to ring in response to an incoming call. In most areas, the sum of the REN of all devices should not exceed four. Contact the local telephone company to determine the maximum REN for your area. The REN for the fax is indicated on the device.
  • Using extra telephone splitters, telephone extension cables, and/or not using the original HP telephone cable supplied with the unit may cause a decrease in ring signals. Disconnect all of these peripherals and use the fax cable supplied with the unit to receive a fax.

Fax not picking up a fax from the telephone answering machine

Sometimes the fax may not detect CNG tones when eavesdropping from the telephone answering machine. The fax may be faulty, the configuration is not set correctly or the fax may not be compatible with the telephone answering machine.
To determine if the fax can eavesdrop into the line, do the following:
  1. Go to the section, Basic information for setting up with a TAM to configure the fax correctly.
  2. Disconnect the telephone answering machine from the line and connect a standard telephone in place of the telephone answering machine.
  3. Get a friend to send you a fax.
  4. When the fax and telephone ring, pick up the receiver on the telephone before the rings to answer on the fax. For example: If the fax rings-to-answer setting is six, pick up the receiver on the telephone before six rings.
  5. Make sure the front panel reads Phone off Hook
  6. Wait and allow the fax to take over the fax call from the telephone as it should eavesdrop on the telephone and hear CNG tones.

Fax kick-in voice calls

If the outgoing message (OGM) or voice conversation has a high tone pitch, the fax may detect a false CNG tone and pick up calls from a telephone answering machine or telephone. The high tone pitch may be recorded from the remote end or the destination end. False CNG tones may result from the type of telephone or telephone answering machine equipment that is connected with the fax.
Ensure that the Outgoing Message (OGM) does not have any background noise or disturbance, as this may result in false CNG tone detection. Also, make sure to speak in a clear, loud voice when recording the Outgoing Message.

Using silent detect

Some older, silent-type fax machines do not emit a CNG tone when calling another fax. They operate only on dedicated phone lines and wait for the receiving fax to answer and signal with a tone. Since there are no CNG tones present on the line, the fax is never activated to receive the incoming fax. For a fax to receive a fax from an older, silent fax machine when using a telephone answering machine, turn Silent Detect on. When Silent Detect is on, the fax listens for either CNG tones or three seconds of silence during the eavesdrop period. If three seconds of silence are detected, the fax will take the call and try to establish communication.
NOTE:Using Silent Detect increases the possibility of voice messages or calls being interrupted by the fax. Since the number of older silent-type fax machines still in use is very small, Silent Detect should be enabled only if faxes from older silent-type fax machines are expected.

Changing the CNG tones

If the previous troubleshooting efforts are unsuccessful, change the CNG tones on the fax.
  1. On the fax, simultaneously press the buttons * and # .
  2. Press 1, 2, and 4 on the fax. The display will show the following: Service X.XXX
  3. Press the right arrow key until the display shows Fax Menu . Then press ENTER or OK .
  4. The display will show r/w parameter . Then press ENTER or OK on this option.
  5. The display will show Parameter 0 .
  6. Follow the table below to select the correct parameter and enter a new value for it.
    Enter the following numbers for the parameters. For example, to set parameter 20, press the 2 followed by 0 on the numeric pad, and then press the Enter or OK button. Replace the Value Currently with the Change To number in the table below. Change all of the values for the parameters listed in the table below.
    ParameterValue CurrentlyChange To
    20400430
    21600650
    2224002300
    2336003500
  7. Press Cancel repeatedly to return to the default screen on the fax.
  8. Send a Test Fax. The fax display should progress from Phone Off Hook to Connecting...
  9. If there was a splitter or other peripheral hardware that needs to be reconnected, do so at this time. Send a test fax after connecting each peripheral device. This will also verify whether any of the peripheral devices were interfering with receiving faxes.

Improving CNG detection

  1. Parameter 28 from 5 to value 3 (sidetone frequencies detected).
  2. Parameter 25 from 2 to value 1 (number of CNG tones needed to detect).
    NOTE:These changes may result in voice calls interrupted by fax.

Improving ring detection

  1. Parameter 7 from 5 to value 10 (ring detect low frequency).
  2. Parameter 8 from 2 to value 99 (ring detect high frequency).
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