Unassigned Number Range
In SfB there was this feature called Unassigned Number Range to upload a range of on premise PSTN Numbers. This allowed us to direct calls that were not assigned to a user to a fallback central number.

6 comments
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Joseph commented
This would be helpful for terminated employees so we can forward the numbers and not pay for the license. They used to have a policy in Skype for this.
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RTM commented
This is important for many reasons, one where the number was previously used by a sales or relationship manager that needs to flow to a main number again if called.
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Martin1962 commented
This is a really important feature for us. If someone leaves our business we need that number to go somewhere after we delete the account. We used to use Unassigned Numbers in SfB to pass the calls to a centralised switchboard now we just get a dropped call - which is really poor.
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Rob Hardman commented
This was present in SfB on prem, it needs adding to 365 Phone System ASAP for the reasons stated below; we shouldn't have callers presented will 'dead' lines when calling DDI numbers just because the previous user has left.
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Ben Clark commented
Agreed this is a much needed feature of Teams.
Thanks -
John Fedor commented
Pretty essential feature to handle numbers not assigned anymore. Easiest way to handle terminations and such without getting a dropped call for people and looking like amateur hour for our phone system implementation.
Thanks.