Use the web interface Web interface wizards
Digi TransPort WR Routers User Guide 104
Dual SIM wizard
The Dual SIM wizard helps you configure your router for dual SIM failover. It will determine the most
appropriate configuration for your circumstances by explaining the options and then asking
questions. Use this wizard to configure the router to detect a link failure and automatically switch to
the second installed SIM. This wizard only helps to configure the most common methods of link
error detection.
This wizard is run from a factory default configuration or close to a factory default configuration. If
changes have been made to the W-WAN configuration other than username, password and APN,
running this wizard could cause unanticipated behavior.
SIM weighting
There are two common dual SIM configurations:
▪ Both SIM cards/slots have equal weighting. In the event of a problem the router will fail over
from one SIM to the other. Once it has failed over it will remain on the alternate SIM until another
problem is detected in which case it will fail back to the original SIM. This method keeps down
time to a minimum. Use this option when no SIM has preference over the other.
▪ One SIM has a higher weighting than the other. After boot-up the router uses primary SIM if
possible. In the event that a problem occurs the router will fail over to the secondary SIM. The
router uses the secondary SIM for a configurable time or until a problem is detected. When either
a problem occurs or the time is up the router will attempt to fail back to the primary SIM. This is
useful if one SIM needs to be preferred over another, for example if the data charges are cheaper
on the primary SIM. Please note, however, that the internal radio module must be power cycled
during SIM switchover. Therefore, attempting to revert to the primary SIM just because the
router uses the secondary SIM for the configured length of time results in an outage. If the router
still cannot use the primary SIM, there is a further delay while the router reverts back to the
secondary SIM.
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