240 CHAPTER 10: SIP-M ODE O PERATIONSEnabling andConfiguring SIPModeTo enable a system to run in SIP mode is a one-step process that hasextensive affects on the system. There is a significant impact on existingtelephone users if you convert an existing operating NBX system to SIPmode, particularly on Auto Attendants and voice mail. Because NBXMessaging is not available on an NBX system operating in SIP mode, youmust reconfigure those services. All existing voice mail configuration andmessages are lost. In addition, many older 3Com telephones and devicescannot support SIP and will be disabled on a SIP mode system.The following topics describe how to enable and configure SIP and adddevices:■ Install and Configure the System for SIP Mode■ Enable SIP Mode■ Add Messaging■ Configure Music on Hold■ Configure Auto Attendants■ Configure ACD Delayed Announcements■ Add Trusted SIP Interfaces■ Add an Optional IP Conferencing ModuleInstall and Configurethe System for SIPModeTo install and configure the system for SIP mode:■ Follow the procedures in the NBX Installation Guide to power up thesystem and configure network connectivity.■ Configure the system-wide settings, such as the system date and time,business identity settings, and so forth.■ Install the 3Com IP Messaging Module, which is described in the IPMessaging Installation Guide (click Downloads > Documentation).Enable SIP Mode To enable SIP mode on your system:1 Log in to the NBX NetSet utility using the administrator login ID andpassword.2 Click System-Wide Settings > Enable Features System-Wide.3 Enable the Enable SIP check box, and then click Apply.4 Click OK.
