Chapter 5 – Configuring the Phone Book
Configuring Alternate Routing
Alternate routing provides an alternate path for calls if the primary IP network cannot carry the traffic. Sometimes during failure, call traffic is temporarily diverted into the PSTN. However, you also use alternate routing to divert traffic to a redundant (backup) unit in case one VOIP unit fails.
Alternate routing facilitates PSTN Failover protection. It allows you to re‐route VOIP calls automatically over the PSTN if the VOIP system fails. You can program the MultiVOIP to respond to excessive delays in the transmission of voice packets, which the MultiVOIP interprets as a failure of the IP network. Upon detecting an excessive delay in transmission of voice packets (overly high “latency” in the network) the MultiVOIP diverts the call to another IP address, which itself is connected to the PSTN (for example, via an FXO port on the self‐same MultiVOIP is connected to the PSTN).
To set up alternate routing:
1.Click Advanced. The Alternate Routing window opens.
2.Specify the IP address of the alternate route for each destination pattern entry in the Outbound Phonebook.
The following table describes alternate routing fields.
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| Alternate Routing Field Definitions |
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Field Name | Values | Description |
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Alternate IP | n.n.n.n | Alternate destination for outbound data traffic if excessive delay in data transmission. |
Address |
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Round Trip | Default is 300 | The Round Trip Delay determines when a data pathway is considered blocked. When the |
Delay | milliseconds | delay exceeds the threshold specified here, the data stream is diverted to the alternate |
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| destination specified as the Alternate IP Address. |
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MultiVOIP® Voice/Fax over IP Gateways | 91 |
