In external network access scenarios of the eSpace UC solution, eSpace UC clients (for example, eSpace Desktop) on external networks finally register with the ( ) to implement the voice function.

In external network access scenarios of the eSpace UC solution, eSpace UC clients (for example, eSpace Desktop) on external networks finally register with the ( ) to implement the voice function.
A . eServer
B . U1900
C . SBC
D . MAA

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Answer: B