SMS Gateway

Features to look:
..SMS-to-Email, Email-to-SMS
..2-way SMS
..multiple user with personal Sent/Inbox
..custom processing for incoming message

Google:
open source 2-way|received|incoming sms gateway windows|XAMPP|wamp

NowSMS/NowSMSLite
- paid (Lite=GBP 195)
- the difference: www.nowsms.com/productinfo
- sample program to process received messages:
www.board4all.cz/showpost.php?p=618770&postcount=19

Ozeki NG
www.ozekisms.com/index.php?owpn=148
- paid

Gammu
+ free
- must develop application to use

Notes:
What about hardware-based/dedicated SMS Gateway?
Example: FoxBox, SMSEagle,
Common drawback with HW-based SMSGW is inability to execute command line

Better use GSM modem than mobile phone
Most standard mobile handsets have an SMS software that was designed to store and display incoming messages to the user of the handset. Often this SMS software "eats" incoming SMS messages, and does not forward it to the PC through the data cable. In this case the Ozeki SMS software, that runs on your PC does not receive the incoming message.
If your phone model is based on the Symbian mobile phone operating system (most high end Nokia and SonyEricsson devices) you will not be able to use it for incoming SMS. Symbian phones never deliver incoming SMS messages and incoming delivery report to the modem interface of the phone.
(www.ozekisms.com/index.php?owpn=543)

If your modem comes with connectivity application, you must turn it off
To configure it, you must close the Internet connectivity application, that comes with the modem (e.g: Vodafone Internet Connection Manager).
(www.ozekisms.com/index.php?owpn=148)

Indonesian online modem seller
www.toekangmodem.com/cms.php?id_cms=4
www.tokopedia.com/search?q=wavecom

Consider Wavecom wanna-be products
SEPUTAR MODEM WAVECOM FASTRACK
http://kiswara.com/seputar-modem-wavecom-fastrack-67-19.info

Setting Gammu untuk Aplikasi SMS Gateway
http://blog.rosihanari.net/setting-gammu-untuk-aplikasi-sms-gateway

Perbandingan SMS Gateway
http://aswandi.or.id/2010/10/07/perbandingan-sms-gateway/