2256 CHAPTER 131: VOICE SUBSCRIBER L INE CONFIGURATIONConfiguring OtherFunctionsFollow these steps to configure other functions:Binding One FXSInterface to One FXOInterfaceThe one-to-one binding of FXS interfaces to FXO interfaces enhances the reliabilityof voice solutions. For industry-specific users, highly reliable communication overFXS subscriber lines is required. In this case, dedicated FXO voice subscriber linescan be used for communication over PSTN even if the IP network is unavailable.The one-to-one binding of FXS interfaces to FXO interfaces can meet thisrequirement to implement highly reliable communication.The one-to-one binding of FXS interfaces to FXO interfaces provides the followingfunctions:■ Dedicated FXO voice subscriber lines: The dedicated FXO voice subscriber linescan be used only for the bound FXS voice subscriber lines and PSTN-originatedcalls received over dedicated FXO voice subscriber lines are directly connectedto the bound FXS voice subscriber lines.■ Consistent state between bound FXS and FXO voices subscriber lines: Theon-hook/off-hook state between the bound FXS and FXO voice subscriber linesis consistent. If an FXS voice subscriber line goes off-hook, the calling party willhear busy tones when the corresponding FXO voice subscriber line receives aPSTN-originated call.ConfigurationPrerequisitesThe router is equipped with FXO and FXS interface cards.The basic functions of FXO and FXS voice subscriber lines are configuredConfiguration Procedure Follow these steps to bind one FXS interface to one FXO interface:To do... Use the command... RemarksEnter system view system-view -Enter voice view voice-setup -Enter FXO voice subscriberline viewsubscriber-line line-number -Set impedance parameters impedance { country-name |r550 | r600 | r650 | r700 | r750| r800 | r850 | r900 | r950 }OptionalBy default, the impedanceparameters are for China.Configure the packet losscompensation modeplc-mode { general |specific }Optionalspecific by default.To do... Use the command... RemarksEnter system view system-view -Enter voice view voice-setup -Enter FXO voice subscriberline viewsubscriber-line line-number -Configure the consistenton-hook/off-hook modebetween the bound FXS andFXO voice subscriber lineshookoff-mode delay bindfxs_subscriber_lineRequiredBy default, the immediateoff-hook is adopted.
