Fatal exception error

Do you have a clear dial tone and you can hear it seems to dial the number ok?

It really depends on what you are trying to do. The phone is technically capable of being used with every Router.

Normally though, the Phone won't need a router to connect to the phone system.

This phone is intended to be set up in a corporate environment or as a Teleworker phone. This phone won't work in a home environment.

The time is set within the phone system, not on the telephone. Contact your vendor for this change.

It's not intended to be connected to a home computer. This phone is a business telephone.

Make sure that it is a Dual Mode 5220. If it is you can use it as a SIP extension. It wiill say it on the back of the Mitel phone next to the 5220.
If it is a dual mode phone you can purchase a sip trunk from a provider and then would be able to use the phone.
When you boot up the phone hold the blue super key while the phone boots, hit the no softkey till you get to phone mode. Hit yes it will allow you to change the phone from minet to sip. This should get you started in the right direction.

Are you attempting to upgrade the firmware on the phone, or the phone system itself?
We have a SX-200 ICP and are currently in the process of upgrading so our teleworkers can use newer phones than the 5220's. It requires you have a current support agreement with your vendor because you have to be able to log into Mitel's Application Management Center (http://www.mitel-amc.com).

To Restore Factory Default Settings:
1. Press both Up and Down Arrow keys simultaneously while powering up the
phone. NETWORK SETTINGS? appears
2. Press NO until TOOLS & FEATURES appears and then press YES.
3. Press NO until RESTORE DEFAULTS? appears and then press YES.
4. Press CONFIRM. The phone resets with default settings.

A cordless plantronics headset will work. A plain bluetooth headset that you use on you cell phone will not work. Mitel sells a new phone with a cordless headset and handset it doesn't use bluetooth it uses dect (europeon version) much but,

I have this phone at work. There's a button that looks like an envelope. Touch that and it will prompt you through recording your voice mail. This phone also features various "away" messages so that you can record a couple different ones and then activate whichever you want depending on your day. This is also accessed through the voicemail button. Once you play around with it a little, you'll find it's a rather simple phone. Right now, I'm trying to figure out how to access my voicemail from home! Good luck!