External modems that
connect to the computer via serial interface and take a SIM card are most popular.
Most mobile phones come with some kind of PC communication suite software these
days. Such software will allow you to send out messages from the computer. If you
want to send messages from another application, you will need to use a software that
exposes message-sending APIs??”either through a socket connection or via command
line. Here are some resources that will help you in setting up your
own gateway:
Kannel (www.kannel.org) is the most popular WAP/SMS gateway in the
open-source world.
Gnokii (www.gnokii.org) can also connect to a phone and send/receive
messages.
PlaySMS (http://playsms.sourceforge.net) is a set of PHP scripts that
can integrate with Kannel, Gnokii, Uplink, and Clickatell.
SMS Link (http://smslink.sourceforge.net) is another SMS server using
a serially attached GSM device.
Developers' Home has some other free SMS libraries listed as well:
http://www.developershome.com/sms/freeLibForSMS.asp.
There are many commercial SMS gateway software solutions that can connect to a
phone or special GSM modem. Search online for "SMS Gateway" and you will get a
long list!
Setting up your own SMS gateway may not be simple.
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