SIP User's Manual 540 Document #: LTRT-12801
MP-500 MSBG
9.20.3 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:
îš„ 100 VDC (sent by the PBX to activate the phone's lamp)
îš„ Stutter dial tone from the PBX
îš„ 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.
Figure 9-53: MWI for Remote Extensions
9.20.4 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.
Figure 9-54: Call Waiting for Remote Extensions
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