Ubigate iBG2016 Configuration Guide© SAMSUNG Electronics Co., Ltd. 461CHAPTER 5. Analog Voice PortIntroduction to Analog Voice Port FeaturesThis chapter describes Analog Voice port Features. Analog Voice port plays arole to transmit voice and call signal between a packet-based network and theexisting telephony network. The configuration of Analog Voice Port isautomatically perceived while booting up the system, and can basically workas a default Configuration.y Analog FXS and FXO Interfacey Analog E&M InterfaceAnalog FXS and FXO InterfaceFXS - Foreign eXchange Subscriber interfaceFXS(the plug on the wall) delivers POTS service from the local phonecompany’s Central Office(CO) and must be connected to subscriberequipment(telephones, modems, and fax machines). In other words an FXSinterface points to the subscriberFXO - Foreign eXchange Office interfaceFXO(the plug on the phone) receives POTS Service, typically from a CentralOffice of the Public Switched Telephone Network(PSTN). In other words anFXO interface points to the Telco office A standard RJ-11 modular telephonecable connects the FXO voice interface card to the PSTN or PBX through atelephone wall outlet.FXO and FXS interfaces indicate on-hook or off-hook status and the seizureof telephone lines by one of two access signaling methods: loop start orground start.