3Com VCX v7111 User Manual page 279

When the PBX rings the FXO V7111 gateway, the ring signal is immediately "sent" to the
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phone connected to the FXS V7111 gateway.
Once the phones handset, connected to the FXS V7111 gateway, is raised, the FXO
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V7111 gateway seizes the PBX line and the voice path is established between the phone
and the PBX line.
There is a one-to-one mapping between PBX lines and FXS V7111 ports. Each PBX line
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is routed to the same phone (connected to the FXS V7111).
The call is disconnected when the phone connected to FXS V7111 goes onhook.
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FXS V7111 Configuration (using the Embedded Web Server)
To configure the FXS V7111:
In the Endpoint Phone Numbers screen, assign the phone numbers 100 to 107 for the
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gateways endpoints.
In the Automatic Dialing screen, enter the phone numbers of the FXO V7111 gateway in
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the Destination Phone Number fields. When a phone connected to port #1 goes offhook,
the FXS gateway automatically dials the number 200.
In the Tel to IP Routing screen, enter 20 in the Destination Phone Prefix field, and the IP
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address of the FXO V7111 gateway (10.1.10.2) in the field IP Address.
In remote extensions, for the transfer to function, hold must be disabled on the FXS
(that is., Enable Hold = 0).
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3Com VCX V7111 VoIP Gateway User Guide
279