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Picking the right mode for your cellular modem connection  The ACM5000 and IM4200-X2 families support internal and external cellular modem. With firmware V3.4 these cellular modems can be configured in four modes of operation:
In this mode a dial-out cellular connection is only established in event of disruption to the main network. The cellular connection normally remains idle - in a low power state - and is only activated in event of a ping failure. This standby mode can suit remote sites with expensive power or very high cellular traffic costs. Refer faq 274 
OoB mode In this mode the dial-out connection to the carrier cellular network is always on, awaiting any incoming traffic. By default the only traffic enabled are incoming SSH access to the console server and its serial ports, and incoming HTTPS access to the console server ... however this can be chagned on the firewall page. There is a low level of keep alive and management traffic going over the cellular network, however generally the status reports and alerts etc from the site can be carried over the main network. This mode is used typically for out of band access to remote sites and this is the mode your cellular modem will be in after configuring as detailed in the Quick Start Guides. Refer faq 354 and faq 393 
Cellular router mode In this mode the dial-out connection to the carrier cellular network is always on, but IP traffic is routed between the cellular connected network and the console server’s local network ports. So care must be taken configuring the router and firewall rules to control access and traffic levels. Refer faq 387 It is also recommended that Cellular Data Usage logging and alerts be enabled if in this mode. This way you can monitor cellular traffic and be notified if traffic levels look to go beyond those you have provided for in your cellular plan with your carrier. 
>Circuit Switched Data (CSD) mode: This is a low performance dial-in mode where the cellular modem can receive incoming calls from remote modems - who dial the modem on a special Data Terminating number. This Data Termination number is provided by your carrier and is in addition to the existing voice number assigned to the SIM. CSD is a legacy form of data transmission developed for old time domain based mobile phone systems like GSM. CSD uses a single radio time slot to deliver low baud rate (9.6kb/s) data transmission to the GSM Network and Switching Subsystem allowing direct calls from any dial-up service. CSD is provided selectively by carriers and is suitable only for very light weight legacy telemetry applications - as most forthcoming 4G networks will not support this service 
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