Cannot Dial Out

To set Unconditional Call Forward ON Dial "*72" for a dial tone. Dial the forwarding number followed by "#". Wait for dial tone. LCD will display "Call FWD Activated"
To Cancel Unconditional Call Forward: dial "*73" and get the dial tone, then hang up. LCD will display "Call FWD Activated

but, since you have tried those two, it could be that there might still be a different type of call forward option that is still ON, on your phone like Busy Call Forward and Delayed Call Forward 1. To Cancel Busy Call Forward: dial "*91". Wait for dial tone. Hang up.
2.To Cancel Delayed Call Forward: Dial "*93" for a dial tone, then hang up.

Let me provide you a link to the website which I used as a reference for your future reference.
http://www.grandstream.com/user_manuals/GXP_User_Manual.pdf

WHat model is the fax machine? Also check to make sure that the phone line and the fax line are not 2 different phone jacks. Also if the phoneline and fax line are on the same jack, make sure to program the fax number into the fax machine. Also, double check if the fax machine has an in and out phone jack that it is in the in jack.

Is there a dial tone? Have you tried plugging in outside in the NID(phone box) on the side if the house. Take a corded telephone out to the box if it has a test port to plug into. If it does, plug in. If you have a dialtone, then the problems inside with either the station wires or jacks, or other equipment that is plugged into the jacks. Remove all devises from the jacks if trouble is inside and take a known working phone and plug it into a jack. if it works, plug in another device, so on and so on. Be sure to check dial tone, break dial tone by pressing a button. Hang phone up and see if dial tone has returned. If not, then that piece of equipment is bad.
If no dial tone at the NID, then call in a trouble report of NO DIAL TONE to the telephone company of cable provider. To save money if trouble is inside, purchase the inside wiring maintenance plan and then have them come work on the phone lines. After the service is restored, call and cancel the maintenance. $5 and you're back in service, provided that's all the teleco charges for wiring maintenance.

Check your phone line by plugging a spare hanset into the wall socket (Incoming line) and listening for a dial tone on this. No dial tone - faulty line connection.
Also check you have plugged in to the correct socket on the back of your fax.

Check the dial pad keys for a stuck button, if it has a hanset with its own dial pad check it as well.

If you can not locate it, try listening on the line and pushing the dail keys one at a time. you should now hear dual tomes, the one you are causing and the offending tone, when you hit the offending key there will onlt be a single tone as this button is already sounding off.Do not forgrt the special keys(# &*)

Hope this is of some help.
Ed

Hi peddler65, did you plug your phone into another area to see if there is a dial tone. Then if not call the phone company or find the D-mark (where your dial tone ) comes into your home and put a jack on that and plug a phone in with all phones in the house unplugged.

Thanks.

Verify that you have a dial-tone by plugging a regular phone into the wall jack

Make sure the phone cord is plugged into the LINE jack..

Dial the number from a regular phone and listen for fax tones.

The problem is possibly the keypad on the phone. Try another phone , preferrably a standard corded phone. If you still cannot break the dial tone, then the problem is with the telephone line (phone company)

Here is your user manual LINK

If you have tried the phone base unit in the same jack that works correctly with your answering machine and you still cannot break dial tone, then you have a defective base unit. Jer