Instruction: Answer the given question using the supporting document.

Input:
Question: Can this unit be used with a regular landline or VoIP system?
Document: I have been an avid user of the GN Netcom (now Jabra) wireless headsets. My current model is the 9125. I was looking for a VOIP solution, and tried this unit out. The promise of landline, VOIP and cell phone integration was intriguing. Unfortunately, the sound quality did not meet my (admittedly high) standards. I took the time to work with support, but could not tune the audio settings to provide a natural, warm sound.
I wear a headset for hours at a time in my home office. It's usually for business calls using my landline deskphone, skype (internet "soft phone"), or my iPhone. For quite a while I've used a Plantronics headset that only worked with my landline phone, and occasionally struggled with bluetooth headsets for my laptop and iPhone. These bluetooth headsets  generally reduced the sound quality.Versatility --With the Jabra Pro 9470, I can now switch seamlessly between my deskphone, my computer, and my iPhone.
Very well designed.Over all I am very happy with this headset, it is the best I've used, and the wireless feature is so convenient. I do hope functionality and integration with more softphone apps is added with firmware updates.EDIT 3/15/11 - After 6 months of useThe Good- Still VERY comfortable.- Mic clarity is outstanding, especially for a wireless unit- Blackout noise cancellation feature is no hype, very impressive!
I have used this device for more than a year. Easy to use and incredibly efficient. Sound is terrific. We use Microsoft Communicator for conference calls and video chat, so a headset is required. I routinely switch between using the headset for regular telephone calls and picking up a video call. Should my cell phone ring in the office it is a simple matter of tapping a button on the touchscreen to change inputs. Easy and seamless. Battery life is fine for a normal day of calls.
This is overly complicated and too expensive. The sound quality is poor and there is a lot of latency in the talk circuit. We have an analog phone system I often hear an echo.Regret buying it.
Overall the products works and I am satisfied, it does have some problems rolling between mobile and landline so your caller may have to wait while it sync with the correct device.
It comes with PC software but not Mac. Not seeing any "Windows only" messages, I took a chance and ordered it anyway. Turns out the Mac "just finds it" as a USB headset, and I can go to the System Preferences > Audio control panel to select it for the computer speaker and/or microphone. My iPhone connects to it via Bluetooth.
The mic is also very good. Setting the mic volume uses a clever idea: the base touchscreen walks you through calling a friend and having them tell you how it sounds while you make your adjustments, though I'm not sure why you can't do this while on a regular call.
I spend a fir amount of time on the phone and have tried headsets from most of the other manufacturers always avoiding Jabra due to the cost involved. I finally took the plunge and am glad I did the headset is comfortable even for extended use and the ability to connect to my Home, Cell and Company VOIP system makes this system a winner
Not so...Well, I went about buying an outdated corded phone (to have a sleek headset, I'm having to revert?) and the Jabra remote headset lifter to hook up and have my new headset finally work. The amount of cords needed to set up this whole system is incredible and it's not simple AT ALL! The headset lifter never lifts and hangs up in the same spot, meaning that 99% of the time I tried to use it, it wouldn't actually hang up.
Answer: Yes, this can be used with any type of phone system. It works best with desksets that have a headphone jack and control from the keypad. But it will work with a regular phone as well but you have to go off hook with it. I use it with my VOIP system, my cell phone (via bluetooth) AND my computer with various dial programs and GoToMeeting.