Hardware Installation Manual 32 Document #: LTRT-10444
5.3.2 Connecting PSTN Fallback for BRI Lines
The device's BRI PSTN Fallback feature provides a wired connection for an ISDN BRI
phone or PBX (line), connected to the device's BRI port, to the ISDN network, upon a
power outage or IP network connectivity loss (i.e., no ping to network).
The BRI PSTN Fallback uses BRI ports #1 and #2. When the BRI PSTN Fallback is
activated, the BRI port #1 metallic relay switch automatically connects BRI ports #1 and #2,
and calls can be routed and established between these entities.
To cable the BRI PSTN Fallback:
1. Connect BRI line 1 (Port #1), located on the rear panel, to an ISDN PBX.
2. Connect BRI line 2 (Port #2)), located on the rear panel, to the ISDN network (PSTN).
Figure 5-9: Cabling BRI PSTN Fallback
Notes:
• The BRI PSTN Fallback feature is a customer-ordered item, which is supported only
on specific hardware configurations providing BRI interfaces. For more information,
contact your AudioCodes sales representative.
• The scenarios upon which the BRI PSTN Fallback is activated (i.e., power outage
and/or IP network loss) are configured by the TrunkLifeLineType parameter. For more
information, refer to the User's Manual.
• The BRI PSTN Fallback feature has no relation to the PSTN Fallback Software
License Key.
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