I have no connection,when I pick both receivers up they light up and both say base but no dialing tone

I want to make sure I understand this completely. You get no dial tone from the fax machine when hooked up to VOIP. In the past, was there an audible dial tone from the fax, or did it just dial silently and give you an error if there was no tone? When you said you got a dial tone by connecting a phone to the ext phone port of "the machine" did you mean the fax machine? If you get a dial tone by running a phone through the fax machine, then the line is good. I have used a fax machine over Sunrocket before they went defunct, which used the same technology base as Vonage - so it should work. If you used to get an audible dial tone when using the fax, and no longer do, and you are geting a dial tone on a regular phone that is connected to the ext. port of the fax machine, then the problem has to be in the fax machine itself, not the VOIP. If you can verify that, we can go from there.

Resetting the voice message waiting indicator
When you receive a new voice mail message, the new message LED on the top of the handset flashes. In the event your message waiting light gets out of sync with your phone company's
voice messaging system, you can manually reset it back to the "No messages waiting" state.
1. Press and hold FiND on the base for five seconds.
Note: The handsets connected to the base will start to beep, however, keep pressing for five seconds.
2. A beep sounds and the message alert tone is reset.
Changing the dial mode
Your phone can communicate with the telephone network in two different ways: tone dialing or pulse dialing. These days, most base networks use a method called tone dialing, so your phone comes programmed for tone dialing. If your phone company uses pulse dialing, you will need to change your phone's dial mode. If you don't get a dial tone or can't connect to the telephone network, please follow the steps below to modify your phone's settings:
1. Press MENU/SELECT.
2. Select the Global Setup menu, and then the Dial Mode submenu.
3. Scroll to highlight Pulse.
4. Press MENU/SELECT. You will hear a confirmation tone.
If you ever need to change the dial mode back to tone dialing, follow the same procedure, but select Tone in step 3.

Finally for future ease of use, here is a link to the user manual were I copied the above information from:

http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/DECT1580-3om.pdf

The battery in the handset could be bad . First I would test that the base unit is recieving dial tone by pressing speaker button on base unit. If there is dial tone then problem is in handset or in base unit communication to handset. Try resetting power to base unit. Check manual for any re-initialization procedure. If the base unit is not receiving dial tone then I would test that the phone line is delivering dial tone to the base unit by connecting a known good phone to the line cord. If the dial tone is not present , problem could be in line cord from outlet, outlet, building wiring, or service provider.

place that headset in the BASE not one of the stand alone chargers for a few seconds. that should "sync" it with the system.

with your main base plugged in you should have lights on it, this means your getting power, now check if your phone wire is plugged into your base all the way. If you pick up your phone and hit the center button it should light up the phone and read connecting, then give a dial tone. if not i would try another phone in that same wall jack and try. If another phone works fine and all your connections are good try replacing phone cord to base and try it. If still no good check that phone in cradle is hs1. handset no. 1 and try. hope this works

You have a feature active on your phone it's more than likely a call forward feature which would redirect you calls. The broken dial tone or stutter dial tone is an indicator a feature is active. Contact you system admin for the clear all feature code and the clear all call forwarding codes.

Your phone is broken, the only solution is to replace it. Call Uniden Customer Service and they should be able to help you. 1-800-297-1023. ( I'm serious, there is no way you can fix this problem with out opening the base unit up and replacing a bad transistor)

I beleive you are referring to a phone which is part of a PBX system or Key-system (sounds more like a Panasonic PBX system). If so, this is a system program that has gone "bonkers". You may need to re-program the automatic outside line dial tone on the system for the specific phone you are referring to.

HOLD THE HANG UP BUTTON AND THE POUND BUTTON DOWN FOR 5 secons. select base unavailable....yes. then hang it up on the base and it will register to the base. if that doesn't work then unplug the base then plug it back in then put the reciever on the base.