All Mitel phones provide staff with a Direct Inward Dial (DID) number. This is just a fancy way of saying a phone number people outside of Seneca, can call you at.
Des Moines DIDs have an alignment with the extension numbers that are assigned.
A lot of times people list it in their email signature as well.
Depending on your extension number, this will tell you what your DID number is:
Your DID is 264-(your 4 digit extension)
All other extensions
Your DID is 261-7(last 3 digits of the extension)