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

The following are Contoso's offices and their details:

• 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 use 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 using Microsoft 365's Phone System instead.

In addition to making sure each user will have their...