MSBR Series 41 MSBR Series
Hardware Installation Manual 6. Cabling the Device
6.3.2 Connecting PSTN Fallback for BRI Lines
The device supports PSTN Fallback for BRI lines. If the device loses power, for example,
due to a power outage or the unplugging of its power cable, it automatically routes calls
from the Tel side to the PSTN (instead of the IP 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 6-11: 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 BRI PSTN Fallback feature has no relation to the PSTN Fallback Software
License Key.
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