Which two statements are true about voice ports on a router？（）
- ACalls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
- BCalls to the PSTN can be made via FXS or T1/E1 trunk ports.
- CAnalog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk ports.
- DCalls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.