Ops .. Sorry, I should have included more information on there :/.
Heads up, I'm not very familiar with this system so bear with me
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System is Mitel_5000_6_0_SP_3_PR_2.
The call flow is that when someone call the main line, they get an automated welcome message that ask for the extension of the party that they trying to reach. If no extension was dialed in, then the welcome message will give the options of dialing 1 for sales, 2 for TS and 3 for customer service.
Thanks for the help in advance !