CHAPTER29 Analog Gateway
Mediant 800 Gateway & E-SBC | User's Manual
➢ To dial from a telephone directly connected to the PBX or from the PSTN:
■ 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.
Message Waiting Indication for Remote Extensions
The device supports the relaying of Message Waiting Indications (MWI) for remote extensions (and
voice mail applications). Instead of subscribing to an MWI server to receive notifications of pending
messages, the FXO device receives subscriptions from the remote FXS device and notifies the
appropriate extension when messages (and the number of messages) are pending.
The FXO device detects an MWI message from the Tel (PBX) side using any one of the following
methods:
■ 100 VDC (sent by the PBX to activate the phone's lamp)
■ Stutter dial tone from the PBX
■ MWI display signal (according to the parameter CallerIDType)
Upon detection of an MWI message, the FXO device sends a SIP NOTIFY message to the IP side.
When receiving this NOTIFY message, the remote FXS device generates an MWI signal toward its
Tel side.
Call Waiting for Remote Extensions
When the FXO device detects a Call Waiting indication (FSK data of the Caller Id - CallerIDType2)
from the PBX, it sends a proprietary INFO message, which includes the caller identification to the
FXS device. Once the FXS device receives this INFO message, it plays a call waiting tone and
sends the caller ID to the relevant port for display. The remote extension connected to the FXS
device can toggle between calls using the Hook Flash button.
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