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Hardware Installation Manual
5.2.2
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). This guarantees call continuity.
The BRI PSTN Fallback uses BRI ports #1 and #2. When the BRI PSTN Fallback is
activated, the internal metallic relay switch of BRI port #1 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).
Notes:
•
For the four-BRI port configuration, fallback is not supported on ports #3 and #4.
•
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.
Media Gateway & E-SBC
Figure 5-5: Cabling BRI PSTN Fallback
27
5. Cabling the Device
Mediant 500L
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