William Herrin herrin-nanog at
Tue Sep 22 16:29:13 UTC 2009

On Tue, Sep 22, 2009 at 11:59 AM, Scott Berkman <scott at> wrote:
> Some people use a serial interface to a specific model cell phones to
> directly send the message over the carrier's cellular network.  This is good
> in the event of isolation of a location from any IP connectivity to a
> carrier gateway.

The Multitech Multimodem GPRS model MTCBA-G-EN-F4 has an ethernet
port. Add a SIM card from your favorite wireless carrier and you can
send and receive SMS messages via "AT" commands over a TCP socket.
Problem is, it seizes up or otherwise founders every few weeks and has
to be power cycled.

Has anyone heard of other products with a good reliability record?

> I believe there was another solution that involved direct carrier
> connections, but these are most likely cost prohibitive in most situations.

Any pointers on this would be greatly appreciated. I have a need for
geographically redundant access to the same phone numbers in order to
send and receive SMS messages. Even if I have to buy a pair of T1s
that are 99.9% idle, it'd be worth it.

Bill Herrin

William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

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