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
Answer: A
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