Steve Kennedy wrote:
On Tue, Dec 12, 2006 at 06:29:43PM -0500, Steve Totaro wrote:
Would this work in the US? I want to use it primarily to send SMS. It
seems that all of the SMS relay companies charge too much. It would be
great to stick my T-Mobile SIM into something like this, route through
asterisk to Kanal. Unlimited SMS is $14.99/mo with T-Mob.
Anyone know what could accomplish this?
You can get a Siemens TC/MC35 GSM terminal and they'll do SMS quite well
(only one SIM per unit), Nokia make one as do Falcom and others.
I think Junghams make a 4 port card.
You'll be limited by throughput on the units though as they can only
handle a certain number of SMS per minute (probably 10 to 20). You also
have to beware that SIMs have a limited numbers of writes and will stop
working after a while (some terminals allow "sim buffering off" which
will hopefully use the terminal's memory to store SMSs).
Utilising a gateway (like Kannel - note spelling) and a SMPP or equiv
protocol may give you higher rates, but there'll be a per SMS charge.
The phone networks I believe use AA19 agreements for SMS termination
(well in the GSM world) and that's a set termination rate between
operators - somewhere between 2 and 3.5p (4 and 7cents), but diffificult
to find out, unless you're an operator.
Steve
What are the limitations of a SIM as far as writes? Is there some sort
of hard number?
Thanks,
Steve
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