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This for $30 may be worth a shot. I don't see an 1/8" jack, though. Check to see if it meets the version and protocol requirements of the control box. It's just a modem, the phone number was most likely input into the Siemens box if it has an interface (take a look inside if you must, carefully) or a device that was hooked to it. If you have multiple sensor ...


If the modem is the only problem, replacing it might well solve the problem. As for finding a particular model of old modem at a non-outrageous price - ebay; sometime patience is needed for a very specific model or to get it at a non-absurd price, but generally modems are pretty cheap there. Where the number is programmed - to be certain, you'd need a ...

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