I have a user who is using a Mitel 5224 IP phone. I have set one of the personal keys to Call History (Missed calls), however the phone will not pick up any missed calls. I have done exactly the same on my 5224 phone and mine works. Any ideas?

SOURCE: Y-JACK headsets with Mitel 5212 ip phone

You can find allot of headsets that will work by googling the set type and the word headset. But I think what you are looking for is found i the programming of your phone system. In the class of service you can have the option for silent monitoring turned on and in feature access code add a code for Monitoring. Yes you are correct this is something for your Mitel vendor complete but i'm sure they would be happy to help.

SOURCE: we have a mitel 3300 connected to cisco CM thru siptrunk

can somebody help me we have a Sip connection between a mitel 3300 and Cisco callmanager only the conference call doesn't work who can help me out

SOURCE: mitel 5220 ip phone locked out

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.

SOURCE: Log In Mitel 5212 IP Phone trouble

you will need to send an email to the system administrator asking for your login information.

SOURCE: how do i manually configure

Press and hold the up arrow.
Configure Phone - Yes
network parameters - yes
press no until you see "change" and press yes.
You will need to set the following appropriately.
IP address, Subnet address, default gateway, ICP controller address, TFTP address, VLAN ID, VLAN priority, DiffServe Value, DNS address.

Normally it is not necessary to set the phone static except for testing. If your network and DHCP server is set up properly, you are not gaining any benefit for setting it static.

Also, you should find out what the other IP addressess are that are static on the Voice subnet. Along with that, you will need to know the DHCP range. These are needed so you don't assign a duplicate IP address to your network. Assign the phone to the wrong device could do great harm to your network. Assign it to use the same IP address as the phone system and none of your phones will operate.

Use with caution,
Mark