Quick Setup Guide A. Optional TDM PSTN Fallback if WAN Fails
BroadCloud SIP Trunk 37 AudioCodes Mediant BRI/PRI Gateway
A Optional TDM PSTN Fallback if WAN Fails
The device can be configured to allow fallback to another TDM interface when/if the WAN
interface goes down, i.e., the BroadCloud connection goes down if (for example) the
integrity of the physical connection is compromised, connectivity is down, service
malfunction occurred, etc. In this configuration, the device must have an extra TDM port to
connect to the local PSTN TDM provider.
Figure 4-22: Extra TDM Port (BRI or PRI) Connected to the Local PSTN TDM Provider
The figure above shows the extra TDM port (BRI or PRI) connected to the local PSTN TDM
provider. Take the steps shown below to provision the device to fall back when/if the WAN
connection fails for any reason, and to revert when the connection is re-established.
A.1 Step 1: Configure BRI or PRI Connection to PSTN
Refer to Section 4.5 to configure the BRI or PRI port accordingly. Complete Step 5a or 5b
(BRI or PRI) and 5c for configuring Trunk Group 4 as the fallback Trunk Group.
A.2 Step 2: Configure Mediant BRI/PRI Gateway Call
Routing Rules
Configure a route rule to re-route outbound calls if the connection to the BroadCloud
service is down.
A.2.1 Step 2a: Configure Outbound Routing for PSTN Fallback
This section shows how to configure outbound IP routing rules if PSTN Fallback is
implemented on the Mediant Gateway.
To configure Tel-to-IP or Outbound IP Routing Rules:
1. Open the Outbound IP Routing Table page (Configuration tab > VoIP > GW and IP
to IP > Routing > Tel to IP Routing).
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