Heres what I did with a similar situation:
In Call Handling, the first entry is the warehouse IP phone, and I have it set for 20 seconds.
The second entry is the front desks DID number NPA-NXX-XXXX and I have it set to 50 seconds.
Then at the bottom of this tab, under Phones will ring: I set as Sequentially.
Is this what you were looking for?
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