请简述一下FXO和FXS接口是如何配合使用？
请简述一下FXO和FXS接口是如何配合使用？
相关考题：
MSR系列路由器上支持下列哪些语音模块（）。A、DFIC-24FXS：24FXO，MIM-8FXS：8FXO高密度1：1语音模块B、FIC-24FXS，MIM-16FXS高密度模拟电话接入模块C、FIC-2VE1，MIM-2VE1高密度语音E1模块D、DSIC-4FXS1FXO，SIC-2FXS：1FXO混合接口模块
What are three Cisco Unified CallManager features？ （）A、 programming interface to external applicationsB、 FXS and FXO port negotiationC、 AutoQos VoIP trust boundariesD、 signaling and device controlE、 LLQ for voice and video trafficF、 directory and XML services
The Neilson Farm has tried, without success, to use both Cisco fax relay and T.38 faxing services with Cisco Unified CallManager Express. The only faxing service that seems to work is fax pass-through. Which port type is connected to their fax device?（）A、FXO B、FXS C、ATA D、FAX E、EM
多选题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.
问答题请简述一下会议通知与请示的行文方向和使用范围？