Case study (five questions)

You are the Teams administrator for an organization called Contoso. Here is your current situation:

Offices, group SIPs, and current coexistence modes

• Chicago

  [e-mail]

  150 users

  Uses Skype for Business Online only (SfBOnly)

• London

  [e-mail]

  350 users

  Uses Teams only (TeamsOnly)

• New York City

  [e-mail]

  500 users

  Uses Skype for Business Online for chats/calls and Teams for collaboration and meetings (SfBWithTeamsCollabAndMeetings)

Devices

All locations are using Windows 10 devices.

The Chicago and New York City locations use iOS mobile devices.

The London office uses Android devices.

Voice project

Contoso plans to assign all users in all locations new phone numbers, discarding their current on-premises solution and existing numbers, and use Microsoft 365's Phone System instead.

In addition to making sure each user will have their own number, each geographic location will need a number assigned...