Dialing from PBX Line or PSTN

The following procedure describes how to dial from a PBX line (i.e., from a telephone directly connected to the PBX) or from the PSTN to the 'remote PBX extension' (i.e., telephone connected to the FXS interface).

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To dial from a telephone directly connected to the PBX or from the PSTN:

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Dial the PBX subscriber number (e.g., phone number 101) in the same way as if the user’s phone was connected directly to the PBX. As soon as the PBX rings the FXO device, the ring signal is ‘sent’ to the phone connected to the FXS device. Once the phone connected to the FXS device is off-hooked, the FXO device seizes the PBX line and the voice path is established between the phone and PBX.

There is one-to-one mapping between PBX lines and FXS device ports. Each PBX line is routed to the same phone (connected to the FXS device). The call disconnects when the phone connected to the FXS device is on-hooked.