88 CHAPTER 8: PLACING , RECEIVING AND DISCONNECTING CALLSSpecialized telephone equipment such as some speakerphones, answeringmachines, and fax machines that require more than 42 VAC ringing voltage maynot detect incoming calls. Refer to Appendix D for details.Distinctive Ringing You can configure the ISDN LAN Modem to distinguish between telephone ringsfor calls to telephones connected to the ISDN LAN Modem’s phone ports. Whenthis feature is enabled, the ringing pattern for calls to telephone number onechanges to distinguish between calls to telephone number one and calls totelephone number two.By default this feature is disabled. To enable, do the following.1 Go to the ISDN LAN Modem’s main configuration page:http://3com.OC.LANmodem/mainpage2 Click ISDN Parameters.3 Locate Distinctive Ringing and then click the box labeled Enable.4 Click Submit.Disconnecting DataCallsYou can disconnect data calls manually or use timers to disconnect callsautomatically.Disconnecting Data CallsManuallyTo disconnect calls manually, do the following:1 From the ISDN LAN Modem home page, click Manual Calling. Alternatively, if youare using the custom browser, click Dial/Hang Up from the Links menu bar.The Manual Call Control window appears.2 In the table, locate the name of the service provider from which you wish todisconnect and then verify that the call is up under the Status of Call column.3 Click Hangup Call.A message indicates that the call is being disconnected.