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Which two VoIP capabilities are utilized when the CallManager and the gateway are configured for Survivable Remote Site Telephony?()

发布日期:2021-09-17

Which two VoIP capabilities are utilized when the ...
A

Analog phones, connected to the PSTN, act as internal call agents if IP communication to the CallManager is lost.

B

An onsite gateway reroutes calls over the PSTN if IP communication to the CallManager is lost.

C

The IP phones can reroute calls over the PSTN if IP communication to the CallManager is lost.

D

Local voice gateways can assume the function of a call agent if IP communication to the CallManager is lost.

E

IP phones use an internal call agent if IP communication to the CallManager is lost.

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