If you dont mind me asking, have you looked into RescueNET software? It seems to have the same functionality, but is flexible, so if you want, it can handle video/sound, as well as most hardware you throw at it. It has its own dedicated dispatch software, as well as dedicated billing.
I'll throw in my opinion and experience. Before becoming an EMT, I visited a company in Cambridge, MA that uses RescueNet, and is both an EMS provider and EMS technology company. They have customized it to their needs, and it seems to work very well. That being said, they have contingency plans for everything, and are flexible if technology doest work.
Here in Israel, my region was testing, and has recently implemented computerized dispatch, time reporting, PCR, billing and analysis, at different levels. For some ragil ambulances, they are dispatched completely by radio (but the dispatcher is looking at a computer screen, and the ambulance has a GPS transponder), all of the patient reporting is on paper (then later typed into the system by the equivalent of unpaid interns), and they never see the technology.
For other ambulances, they have large Motorola PDAs that interface with the system are are mainly used for time reporting, but PCRs can also be completed. Those ambulances carry a bluetooth printer, so at the hospital, in addition to sending the report to dispatch, they can leave a copy in the patient's file, as well as print the bill.
For all of the Natan/Atan (ALS), they have a Windows 2k machine between the driver and passenger's seats (it swivels left and right, and has an arm so it can be used from the paramedic's seat), with GPS directions (that are very good, if you consider Israeli streets). They do all of their time reporting and most of the PCRs and bills there (with on board printer).
All of this also feeds into the pager system (which is nationwide), and often calls come in over the pagers before the dispatcher can get on the radio or send it on the computer.
I think what makes this system work so well is that everything can function completely without it. From dispatch, that can work off of paper in a matter of minutes (and some dispatchers still do), all of the PCRs can, and at times are paper, and all of the radio reports aren't dependent on the computers. Israelis are notoriously bad at advanced planning, but excellent at on-the-spot thinking-- when they need something, they make it work.