User Manual
To configure dual SIM failover, you need to:
1. Choose which of the SIMs is to be the Primary. The other SIM will be the secondary/failover. It is
recommended that an explicit slot is chosen, rather than leaving it on Automatic. Select Internal
Cellular Modem panel on the System > Dial menu nominate which slot (Top or Bottom) contains the
Primary
2. Check Enable SIM Failover
3. Specify how the device will Failback from the failover SIM to the Primary SIM. There are two options
o On Disconnect failbacks to the Primary SIM only after the connection on the failover SIM has
failed its ping test
o On Timeout failbacks to the Primary SIM after the connection on the failover SIM has been up
for the timeout period. The timeout period is either the default value of 600 seconds or the
number of seconds you have specified in the Failback Timeout field
4. Configure each SIM connection with as much information to make a successful connection given
sufficient signal strength from the cell service provider
5. Enter a Failback Test IP address for each SIM. This IP address is used to ping test the status of the
cell modem connection and to determine if SIM failover or failback is to take place.
Configuring DDNS and the Modem Watchdog are optional. DDNS, when configured, is applied to the
cell modem dial out connection regardless of which SIM is in use. Dual SIM failover is for dial out
connections only
4.6.7 Automatic SIM Slot Detection
If a single SIM card is used in a Dual SIM slot product, the console server selects that slot. If both slots are
populated, the bottom SIM slot is used.
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