ZyXEL ISG50-PSTN User Guide - Page 436
The Peer to Peer Screen
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Chapter 27 Global PBX Settings Click Configuration > PBX > Global > Fake IP to view the screen as shown next. Figure 281 Configuration > PBX > Global > Fake IP Each field is described in the following table. Table 144 Server > Fake IP LABEL Enable Fake IP DESCRIPTION Turn on fake IP to have the ISG50 replace the IP address inside all outgoing SIP packets with the IP address of the upstream NAT router on your network. When the packets get to their destination, the destination device can send its response to the embedded address of the NAT router. The NAT router then forwards the packets downstream to the ISG50, which in turn sends them to the device on the local end of the telephone conversation. Fake IP Setting Apply Reset If you enable it, you must assign a value to the Fake IP Setting field. Enter the public IP address that the upstream NAT router uses to send out the ISG50's SIP traffic. This is the IP address that will be inserted into all outgoing SIP traffic. Click this to save your changes. Click this to set every field in this screen to its last-saved value. 27.6 The Peer to Peer Screen Use this screen to allow the ISG50 to set up a direct connection between two IP phones on the same subnet. This allows the ISG50 to remain free of the loading burden and free up IP PBX resources (such as DSP channels). When a special feature request is made by either end of the connection, such as call parking or music on hold, then the ISG50 re-establishes control of the connection to implement the feature. Click Configuration > PBX > Global > Peer to Peer to view the screen as shown next. Figure 282 Configuration > PBX > Global > Peer to Peer 436 ISG50 User's Guide
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