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I just lost a server by restarting the network interfaces.

Then i got the following idea:

A small GSM device with an RS232 connector

I want to connect the serial console to the device, and in case the server gets unreachable i could call it by phone and get full access to the serial console

So here comes the question: are there such devices?

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Yup. Check out Digi's range of products - you probably want the Digi Connect WAN. I've used these at colos for backup/last resort connectivitiy. They're not particularly cheap though.

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