问题:
A . Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
B . Calls to the PSTN can be made via FXS or T1/E1 trunk ports.
C . Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.
D . Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.
● 参考解析
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