Making and Answering Calls
Adjust the Volume during a Call
Press the “Volume up” button to increase the volume, and the "Volume down" button to decrease the volume. The handset will now store and keep the new volume level. You can also use the navigation keys 
and 
to adjust the volume.
Open Contacts during a Call
1.Press the "More" soft key.
2.Select "Contacts".
3.Press "Select".
4.Select "Call contact" to search a local or company phonebook contact, or select "Central phonebook" to search a central phonebook contact.
5.Press "Select".
6.Select a contact.
Note:
You can call the selected contact by pressing "Call". When calling the contact, the first call will be put on hold. See the Mitel 5624 Wireless Handset Configuration Guide.
Turn on/off the Microphone during a Call
1.Press "More".
2.Select "Microphone off".
3.Press "Select".
The icon 
indicates a silenced microphone. This means that the other party in an ongoing call cannot hear you.
To turn the microphone back on:
1.Press "More".
2.Select "Microphone on".
3.Press "Select".
You can turn the microphone off/on by a long press on 
.
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