Here's a procedure I put together for the Service Desk staff here to start building extensions. It's been heavily edited to remove information, but the gist of it is here.
5) Once a number is determined, proceed to create the account.
a. (if necessary) Login to the appropriate Mitel 3300 controller
b. From the left pane, expand the Users and Devices menu and select User and Device Configuration
c. Click the Add button and select Default User and Device .
6) In the window that loads, fill out the following information.
a. On the Profile tab:
i. Under User Profile:
1. Input the user’s First and Last name in the corresponding fields.
ii. Under Service Profile:
1. In the Number field, input the 4 digit DID number
2. For hot desk users, place a check in the box next to Hot Desking User.
3. Under Secondary Element, select the appropriate Secondary controller.
b. Select the Service Details tab:
i. Class of service defines controls that can be used to define what the users and/or devices can use as well as set system resources in pre-defined situations.
1. Input the COS created for Hot desking users for Day, Night1 and Night2 modes.
2. INput the COR created for hot desking users (if any)
c. Select the Access and Authentication tab:
i. Set the User Pin and Confirm User Pin to the extension number.
ii. Click the ‘Apply’ button. Wait for the changes to save.
d. Select the Keys tab:
i. Click the ‘Change All Keys’ button.
ii. According to their position/title, configure the key assignments accordingly
iii. Click Save (bottom of page) to save key configurations. The Key window will close
e. Click Save again to save changes to the Hot Desk account
7) Configure call forwarding for user.
a. Call Forwarding defines where to forward an incoming call to if the line is busy or not answered.
i. From the left menu, expand Advanced Configuration and select Call Forwarding Profile.
Configure Call Routing
a. Call Rerouting lets the system redirect calls to alternate answering points or devices, under specified conditions. Call Rerouting may be used to redirect calls either always (in Day, Night 1, and/or Night 2 mode) or under busy, no answer, or Do Not Disturb conditions. Call Rerouting is dependent upon the type of calling device, the type of terminating device, and the entries specified in the Call Rerouting forms. Rerouting is also affected by conditions invoked by the user (such as Call Forward). The system is currently configured to forward calls to the voicemail server first, and in the event of a network/system failure to the backup voicemail system.
i. From the left menu pane, expand Call Routing, then Call Handling and select Call Rerouting.