What should you install upstream of the PBX?

You have a Microsoft Teams Phone deployment.

You have a PBX that connects to the PSTN by using an E1/T1 Primary Rate interface (PRI).

You plan to migrate to Direct Routing by using the existing PSTN services.

What should you install upstream of the PBX?
A . a physical Session Border Controller (SBC)
B . an FXO SIP Analog Telephony Adapter (ATA)
C . a virtual Session Border Controller (SBC)
D . a Session Border Controller (SBC) in Azure

View Answer

Answer: A