Errika:
First off you are very limited as to what you can set up through the telephone and if you default the Dispatch, it will revert back to the factory settings and without the Laptop admin software, you will not be able to put everything back the way it is now.
Have you tried powering down and back up to see if that will reset the voicemail and at least get it back online?
****Before doing this please read below***
If not, simply go to the Dispatch Voicemail system. On the right side of the box you will see a black power cord. Follow that down to the Power outlet and make sure that you see the transformer (Black and about 4" x 4" square). Once you verify that this is the power for Dispatch, I've found that it is easier to unplug it at the Dispatch unit than the transformer plug in. Just pull the connector out of the Dispatch box. ***One thing that I want to mention is that above the power connect is a retangular panel/door with 2 tabs located at the top and bottom of the panel. Inside you have 8 regualar AA batteries that hold up the systems programming. If the system hasn't been serviced and those batteries maintained, when you power off the system, it will default anyway and unless you know how to set up dispatch, you will be without service and probably will have to route a tech to repair the situation.
Do you know how to program the system from scratch? How long since the batteries were checked or the system serviced? Please answer the questions and I am getting my manual to see what we can do to get that system out of AA and back online!