08 · Emergency, LBR, survivability
A WAN cut should not remove the ability to place a local PSTN call, including emergency.
A Survivable Branch Appliance keeps a limited calling set for clients that can reach it when Microsoft 365 cannot. It is a Direct Routing feature. Meetings, presence, and the rest of the cloud are not the survivable set. Confirm the feature list for the firmware you run.
Test a WAN cut in a window. An SBA that has never been tested is a packing slip. Analog devices such as elevators need a path that does not depend on a Teams user signed in through the dead WAN.
A Survivable Branch Appliance keeps local PSTN up when the branch cannot reach Microsoft 365. Test the cut.
SBA is local PSTN survivability for Direct Routing, not a full Teams cloud.
If it fails: The WAN fails and emergency calls fail with it because no local path was tested.
Which description of Location-based routing is accurate?
Stops a user in a regulated site from placing a PSTN call through a gateway in another site. It is a toll-bypass control. Media bypass can fight it if media would egress in the wrong place. Source: https://learn.microsoft.com/en-us/microsoftteams/location-based-routing-plan accessed 2026-10-14.
A colleague reports: A traveler’s laptop in one country egresses through another country’s SBC. Where do you start?
A traveler’s laptop in one country egresses through another country’s SBC. Enable it per site with the network topology and the gateways that belong there. Source: https://learn.microsoft.com/en-us/microsoftteams/location-based-routing-plan accessed 2026-10-14.
Which description of Survivable Branch Appliance is accurate?
A Direct Routing appliance that can keep local PSTN calling when the branch cannot reach Microsoft 365. It is not a full Teams cloud. Meetings and presence are not the survivable feature set. Source: https://learn.microsoft.com/en-us/microsoftteams/direct-routing-survivable-branch-appliance accessed 2026-10-14.
Around the call: compliance recording, workforce management, emergency location, analytics, CRM screen pop, and an agent with a human escape. Each one has its own failure.
The WAN fails and emergency calls fail with it because no local path was tested.
Cisco CUBE is one of the SBC families named in this lab’s certification lesson. A certified release can be the Direct Routing SBC between Unified CM and Teams.
The tenant still needs a verified domain on the SBC FQDN, and the user still needs Teams Phone. The studio translator does not open a live AXL session. Confirm the current certified release before you build.
Teams Phone and Webex Calling are separate clouds. This lab does not describe a feature that registers a Webex Calling user into a Teams tenant.
A number move is usually a carrier port, a certified SBC, or a meetings interop product. Confirm before relying.
Unified CCE stays the ACD until you migrate it. Microsoft’s contact-center articles name Connect, Extend, and Unify. They do not name a UCCE connector in the notes this lab cites.
Voice into Teams is still Direct Routing or Operator Connect. The routing script stays on the contact-center product you bought. Confirm the vendor’s current model. Source: https://learn.microsoft.com/en-us/microsoftteams/teams-contact-center.
Copilot Studio, Azure Communication Services, and Graph are later tracks in this lab. Treat any uncited limit as confirm before relying.
Opened 2026-10. A row marked confirm did not open. Wikipedia is background. The Teams blog row is the community index.
