Multi-Tech Systems MVP-2410 ユーザーズマニュアル

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Clicking on the Advanced button brings up the Alternate Routing secondary screen. 
This feature provides an alternate path for calls if the primary IP network cannot carry 
the traffic.  Often in cases of failure, call traffic is temporarily diverted into the PSTN. 
However, this feature could also be used to divert traffic to a redundant (backup) unit 
in case one voip unit fails.  The user must specify the IP address of the alternate route 
for each destination pattern entry in the Outbound Phonebook.