I cant seem to send a fax on my dsl line I have a hp640

change the Cartridge! come on! the instructions are IN the machine!

are you sure you have ink in the ink cartridge? Try just making a copy and check it out

open the front panel door and take out the ink cartridge by sliding it downwards and then pulling it towards yourself. in order to put the cartridge inside the printer you need to insert the same by sliding it from top to bottom and once you hear a click sound it means the cartridge has been installed

Magic Jack will work with fax machines. You may have to experiment by slowing down the fax machines modem transmits speed. This is done in the machines menu.

The Magic Jack manual is quite clear, it can handle faxing.

Since the fax machine is about 4 weeks old, why not give it back to HP? Warranty still covers it.

The recipient may have a DSL phone line, or receiving to a fax server that blocks your area code.

You need a dedicated ANALOG phone line.

A DSL filter screens out ANALOG signals to a DSL device.not the other way around. There are no DIGITAL fax machines.

All fax machines are ANALOG devices. They are designed to work on POTS (Plain Old Telephone System). Any other condition is a **** shoot.

I had been confused for the past ten months on this issue and just figured it out! Get a distinctive ring from you telephone service. If you have a answering machine, set it to answer on the 4th ring. On the fax, press menue til you get to the BASIC FAX, press OK, scroll the arrow button til you get to the DISTINCTIVE RING, press OK. Call your special fax number assigned from the telephone co, the machine should read DRPD OK, then on the face of the hp640 on the left i believe is a button called Rcv. Mode/Contrast, press that til you get to DRPD Mode, press OK. It should work great!! Hope this helps.

Plug a regular phone into the wall jack and call a fax nunber, listen for fax tones. You don't have DSL, do you?