ADTRAN IP SoftPhone User Manual The Settings Dialog61950859L1-1A Copyright © 2006 ADTRAN, Inc. 35AdvancedFigure 7 shows the Advanced menu for SIP account configuration. Use this menu to further customizeyour SIP account. Forwarding options are specified here. The ADTRAN IP SoftPhone can be set to notforward calls, to forward call to a specified URL, or to forward calls to a specified voicemail URL.Additionally, the ADTRAN IP SoftPhone can designate an associated dialing prefix to use for making callsthrough that specific SIP account. To access a specific SIP account, enter the appropriate prefix beforeentering the desired number to call. To view or change the dialing prefix, use the displayed prefix toaccess the specific SIP account, or change the prefix to one more acceptable for accessing the specific SIPaccount.When the information is complete, select OK to save the settings.Figure 7. SIP Account Advanced Menu