Question about HP Officejet Pro L7780 All-In-One InkJet Printer

2 Answers

BLOCKED CALLS WHENEVER SOMEONE TRIES TO FAX ME I GET A BLOCKED CALL DISCONNECT SCREEN AND THEY GET A BUSY MESSAGE. PLEASE HELP!!!!! I have an HP Officejet Pro L7780, and all of a sudden I can't receive faxes. I get: Blocked calls are not displayed on this report. For more information, see Junk Fax Report and the Caller ID Report. A communication error occured during the fax transmission. I can't send out faxes either.

Posted by on

  • LindaSueC Feb 11, 2009

    Thank you frcs68 for trying! I checked my junk fax and I turned off the block junk fax option. Then I tried faxing again, and it did fax 2 pages, but then it failed again with the communications error.

    I called HP support, and they claim it is because my fax phone line is through Cox Cable -- faxes require an analog line. They did have me turn off ECC and set the fax speed to slow, but that didn't help.

    Cox says there should be no problems, because their phone lines are converted from digital to analog before it reaches the fax machine.

    I don't understand. If it is indeed because of the phone line, then this should have been a problem from day one, and that was 2 years ago. I've had the same printer and the same phone service for the past two years with no problems.

    If anyone has any other suggestions, I'd sure love to hear them.

    Thank you.

  • LindaSueC Feb 11, 2009

    Again thank you, frcs68!

    Unfortunately, I am trapped in a 3 year contract -- one year left -- with Cox Cable. Anyway, I complained to Cox and they sent someone out and replaced my modem. So I was *finally* able to fax my document I've beent trying to fax for 2 days.

    I think Cox got wind of the fact that I'm switching 2 of my phone lines to a real phone company, and they're messing with me. They said I could remove 2 of my 3 lines and still be in compliant with my contract. Unfortunately, I wasn't planning on switching my fax line . . . I had no idea the fax would start having problems with Cox.

    Thanks again!



2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has achieved Level 3.

  • Master
  • 478 Answers

I have use LEO Privacy, which helps me to block all spam and unwanted calls and lock all private apps. I suggest everyone to download it and check it out hide photos/videos feature. LEO Privacy Applock Boost Hide Android Apps on Google Play

Posted on Nov 23, 2016

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 1,605 Answers

If you subscribe to a caller ID service through your phone provider, you can block
specific fax numbers so the device does not print faxes received from those numbers.
When an incoming fax call is received, the device compares the number to the list of
junk fax numbers to determine if the call should be blocked. If the number matches a
number in the blocked fax numbers list, the fax is not printed.
Set the junk fax mode
By default, Block Junk Fax mode is turned On. If you do not subscribe to a caller ID
service through your phone provider, or do not want to use this feature, you can turn
off this setting.
To set the junk fax mode
▲ Some models have a Block Junk Fax button. Depending on the model you have,
do one of the following:
Block Junk Fax button: Press the Junk Fax Blocker button, select the Block
Junk Fax option, and then select On or Off.
Color display menu: Press Setup, select Basic Fax Menu, select Junk Fax
Blocker Setup, select Block Junk Fax, and then select On or Off.
Add numbers to the junk fax list
There are two ways to add a number to your junk list. You can select numbers from
your caller ID history, or you can enter new numbers. The numbers in your junk list are
blocked if Block Junk Fax mode is set to On.

Posted on Feb 11, 2009

  • 1 more comment 
  • Frank
    Frank Feb 11, 2009

    To select a number from the caller ID list

    1. Press Setup.

    2. Press Basic Fax Setup, and then press Junk Fax Blocker Setup.

    3. Press Add number to Junk List, and then press Select Number.

    4. Press the right arrow button to scroll through the numbers from which you have

    received faxes. When the number you want to block appears, press OK to select it.

    5. When the Select Another? prompt appears, do one of the following:

    If you want to add another number to the list of junk fax numbers, press

    Yes, and then repeat step 4 for each number you want to block.

    If you are done, press No.

  • Frank
    Frank Feb 11, 2009

    HP Fax and All-in-One products are designed, according to international standards, to work with traditional, analog telephone services and might experience some difficulties when connected to phone lines with digital services. Make sure that the product is connected to an analog telephone service.
    It has worked for last 2 years means that thephone company just changed from anlog to digital line, that is causing the problem.
    since HP or any other all-in-one printer vendors have not catch up with the communication industrial. we are not going to see any digial fax machine any time soon.
    The best bet is to call the phone company and have them install a POS (plan old telephone) line.

  • Frank
    Frank Feb 12, 2009

    you welcome



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Rx Fax info mismatch

Fax with Popfax with no more sending errors, busy signals, paper jam or faxes lost. So easy to setup Popfax service: no phone line installation or hardware purchasing required. Usually it takes only a few minutes to decide which package to choose and to subscribe to an internet fax service. The only things required are a device (Laptop, PC, Tablet or Smartphone) and an Internet connection. Try for free!

Jul 30, 2013 | Office Equipment & Supplies

1 Answer

When someone from the outside tries to fax they say the line is busy

when this happens you may have to contact your network provider or subscriber to fix the problem. The phone line is probably faulty and it could be a technical issue. However if it is a cell phone you might have touched something on the settings that makes the phone to be bussy whenever someone calls. you can go back to the settings and make sure that it allows incoming calls and that they are not bared.hosea

Mar 18, 2011 | Computers & Internet

1 Answer

Can't fax to one number

Call that number from a regular phone, if you get the same message there is a problem with the receiving machine.

Jan 23, 2009 | HP 1040 Plain Paper Inkjet Fax

2 Answers

Tone And Message

Call Divert
The GSM standard knows two kinds of call divert:
  • Unconditional call divert
  • Conditional call divert
Conditional call divert occurs on any of three conditions:
  • Divert if no answer after 'x' seconds
  • Divert if unavailable (cellphone switched off or out of range)
  • Divert if line busy
Furthermore, the GSM standard knows three different types of call:
  • Voice call: normal communications when you pick up the phone to talk to someone.
  • Fax calls: the GSM terminal being called is a fax machine.
  • Data calls: your cellphone is acting as a modem hooked up to a computer accepting inbound data from elsewhere.
Each call type is assigned a number: 11 for voice calls, 13 for fax calls, 25 for data calls.

You can activate or cancel conditional call divert on your device. To do so:

##62# : Cancel divert for all call types
##62*11# : Cancel divert for voice calls
##62*13# : Cancel divert for fax calls
##62*25# : Cancel divert for data calls

This code does not hurt your device only helps it to tell it what to do in certain situation of a voice, data, or fax call.

This is a link to a site which goes a little more in depth with the meaning of conditional/unconditional call diverting is. Hope this helps!!!

Dec 17, 2008 | LG CE110 Cellular Phone

1 Answer

Phone line gets busy tone while recieving fax in DRPD mode

As I understand it, this is as it should be. You have two different numbers sharing the same physical line and only one can be active at any one time, so if you are using the phone and someone tries to fax, the fax line will be engaged and similarly, if you are sending a fax and someone tries to ring on your phone line, it will be engaged.

Nov 07, 2008 | Samsung SCX 4521F All-In-One Laser Printer

1 Answer


If you have dial-up for your internet access you cannot be online when a fax is coming through. The line has to be free to receive the fax.

May 03, 2008 | HP PSC 950 All-In-One InkJet Printer

1 Answer

HP 6210

there is the problem in your printer board

Sep 13, 2007 | HP OfficeJet 6210 All-In-One InkJet...

Not finding what you are looking for?
HP Officejet Pro L7780 All-In-One InkJet Printer Logo

451 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Office Equipment & Supplies Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 3 Expert

1089 Answers


Level 3 Expert

102366 Answers

Are you a HP Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides