Which two statements are true about voice ports on a router? (Choose two)

Which two statements are true about voice ports on a router? (Choose two)

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.