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          1. Support

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            Multi-site Configuration for Gateways with Analog PBX

            This note shows how to configure MX series VoIP gateways with FXS and FXO ports to interconnect with analog PBXs installed in one or multiple sites and all inter-site calls are made by dialing the called party’s extension without extra prefix digits.

            Scenario

            In this scenario, five gateways with analog PBXs are located at different sites connected on the same LAN.

            Gateway    IP Address    PBX Extension Number
            In this diagram, each gateway is installed with the FXO ports connecting to the extension ports (FXS ports) of the PBX while the WAN port connecting to the switch in the local office. All gateways are interconnected over the IP network with SIP protocol in peer-to-peer mode for call set-up.
            Note: A static public IP address is required if the IP network is Internet.

            Configuration on Gateway A

            1.On Routing > Routing Table page, setup the routing rules for directing call from FXO port to IP and vice versa, as follows:

            2.On the Line > Trunk, select Second stage dialing in the inbound handle field, and select Dialing tone.

            Configuration on Gateway B

            1.On Routing > Routing Table page, do the similar routing as follows.

            2.On the Line > Trunk, same as we did on gateway A.

            Configuration on Gateway C

            1.On Routing > Routing Table page, do the similar routing as follows.

            2.On the Line > Trunk, same as we did on gateway A.

            Configuration on Gateway D

            1.On Routing > Routing Table page, do the similar routing as follows.

            2.On the Line > Trunk, same as we did on gateway A.

            Configuration on Gateway E

            1.On Routing > Routing Table page, do the similar routing as follows.

            2.On the Line > Trunk, same as we did on gateway A.

            Dialing Method

            For making calls from one site (for example extension 100)to an extension on the other site (for example extension 200), the user of extension 100 picks up the phone and dials the number for the local extension port which connects to the gateway (101 in this example), and then dials 200 after hearing the second stage dial tone from the local gateway.

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