ZyXEL ISG50-PSTN User Guide - Page 478
Outbound Trunk, FXO Trunk, BRI Trunk, SIP Trunk, Trusted Peer Trunk, Using Multiple ISDN Numbers
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Chapter 30 Outbound Trunk Group • Use the LCR screens (starting in Section 31.2 on page 505) to configure the Configure Least Cost Routing (LCR) dialing rules. 30.1.2 What You Need to Know The following terms and concepts may help you as you read through the chapter. Outbound Trunk The outbound lines define a connection between the ISG50 and the PSTN, ISDN, ITSP or your trusted peer (another ISG50). To make calls from extensions on your network you still have to define LCRs, which are outbound dialing rules (See Chapter 32 on page 519). You also have to configure an auto-attendant to handle the forwarding of incoming calls (See Chapter 31 on page 503). FXO Trunk FXO trunks allow you to connect to the PSTN (through your traditional analog telephone service provider) or a traditional analog PBX in your organization. BRI Trunk BRI trunks allow you to connect to the ISDN or an ISDN PBX in your organization. SIP Trunk SIP trunks allow you to connect to a VoIP service provider. Trusted Peer Trunk Trusted peers refer to connections to another SIP server (for example another ISG50) that has configured your ISG50 as a trusted peer. Your organization may want to use trusted peer connections between remote branch offices. Using Multiple ISDN Numbers You may have multiple ISDN numbers from your ISDN service provider. You can map these numbers to the AA (Auto Attendant) and directly to extension numbers. Note: Use AA if you do not have multiple ISDN numbers. 478 ISG50 User's Guide
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