ZyXEL ISG50-PSTN User Guide - Page 538

Chapter 34 Call Services The following table describes the labels in this screen. Table 193 Configuration > PBX > Call Service > Call Waiting Setting LABEL DESCRIPTION Extension Pool / Enabled Extension Call waiting applies to the extensions you move to the Enabled Extension list. To add an extension, select it in the Extension Pool field and click the Right button (to add it into the Enabled Extension list). You can remove extensions from the enabled list by selecting them and clicking the Left button. Apply Click this to save your changes and to apply them to the ISG50. Reset Click this to set every field in this screen to its last-saved value. 34.5 The Emergency Call Screen The ISG50 allows you to specify and give higher priority to emergency calls to emergency services. You can configure a list of emergency phone numbers, for example police or fire department, on the ISG50. The ISG50 recognizes when an emergency number is dialed and tries to send the call to the configured destination number. If all the lines on the ISG50 are busy, the ISG50 frees up a line by hanging up an existing conversation and then passing the emergency call to the destination number. An FXO or BRI outside line has higher priority than a SIP trunk for emergency call use. 34.5.1 Configuring the Emergency Call Screen Click Configuration > PBX > Call Service > Emergency Call to view the following screen.Use this screen to manage emergency call numbers on the ISG50. Figure 359 Configuration > PBX > Call Service >Emergency Call 538 ISG50 User's Guide