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Related Links
Should you wish to dig deeper into this matter, develop your own application
or try other related applications, here are a few categorized links that I
found usefull and that might help you getting started.
 
Did you notice any link to be broken ? Or do you know of any valuable 
resource that should be included here ? Please feel free to
let me know about it.
 
 SMSLink Companion Sites
 
  - SMS Link Add On'S: Full-featured,
    native Win32 client, Linux-based queue server for pre-0.55b installs and complete
    schematics of serial+power combo cable for handheld mobiles.
 
  - Riccardo Facchetti's Home Page:
    You'll find libmodem (and more) in the "download" section of his site.
 
 
 GSM Generic Info
 
  - GSM Home: Intel-sponsored GSM
    site with lots of links.
  
 SMS Generic Info
 
 SMS Protocol Info
 
  - ETSI: ETSI Home Page. You can
    register and download some freely available protocol specs, GSM 03.40
    being one of them.
  
 - SMS messages and the PDU format:
    a very detailed explanation of PDU message format and encoding.
    Good introduction
    to some key concepts, and in-depth discussion of each field.
    The best reference there is, outside
    ETSI itself.
  
 - SMS PDU Info:
    Field by field description of the PDU format, color-coded and with some
    accompanying comments.
 
  - SMS: Well presented
    definition of most basic concepts and terms related to GSM and
    SMS processing. Pointers to the reference mentionned
    above.
  
 - SendMyStuff by "@_:
    a more detailed description of PDU format, with code example.
  
 SNPP Protocol Info
(SNPP = Simple Network Paging Protocol) 
 SMPP Protocol Info
(SMPP = Short Message Peer-to-Peer) 
  - SMS Forum: established to foster and promote
    SMS to the benefit of the Wireless Industry, and to manage/enhance SMPP.
 
 
 GSM Modules Tech Info
 
  - Falcom A1:
    Manual for FALCOM A1 as PDF - File, Version 2.77.
  
 - Falcom A2:
    Manual for FALCOM A2 as PDF - File.
  
 - Falcom A2D:
    Manual for FALCOM A2D as PDF - File (V1.06).
  
 - GenSM-2:
    Manual for Gener GenSM-2 (aka Wavecom WM02), firmware ver. 3.20 and above.
  
 - 
    Siemens M1: Siemens M1 manual (PDF file).
  
 - AT+C commands:
    a comparison of all the at+c commands and their syntax supported on each
    of the major GSM modules.
  
 Related Apps
 
  - SMS Server Tools:
    Full-featured SMS gateway, quite close to SMSLink in functionalities. Also uses
    GSM modems to send.
 
  - SMS Client: Angelo Masci's
    SMS sending software. Uses a plain modem and the provider's dial-up
    interface to SMS. Requires a provider-specific "driver". Also features
    an address book.
  
 - SMaSh: SMaSh is a program 
    for sending messages to digital phones, pagers and other devices you can 
    communicate with. Client / server architecture and dynamic plugin
    system. Currently features plugins for dialup access to various
    providers and for net access to web-based forms.
  
 - Alamin GSM SMS Gateway: gateway
    for exchanging messages between GSM and IP networks. Currently supports
    Nokia phones through Gnokii, and GSM modems allowing the sending of
    SMS in text mode.
  
 - Kannel: Open Source WAP and 
    SMS gateway by Wapit Ltd.
  
 - SmsSend:
    allows you to send free SMS to any GSM, connecting to Internet sites using
    scripts. It is available both for Windows and Unix.
  
 - Pagey:
     Pagey is a paging/SMS daemon written entirely in Python. It accepts
     SNPP connections and supports multiple paging devices (currently 
     Siemens M1and M20 SMS devices). It comes with a simple Email to SMS
     gateway.
  
 - Boomerang GSM:
    commercial but open-source development library for Delphi and Kylix.
    Enables sending and receiving SMS, EMS, SmartMessages, EMI, SMPP,
    Siemens SEO, etc. from graphical or command-line programs.
  
 - mail2sms:
    converts an email to a string susceptible of being sent via SMS. Doesn't
    deal with the sending itself.
  
 - email2sms:
    like the previous one, but written in Perl, and using a special Perl
    module to "compress" the text by removing spaces and unnecessary vowels.
    Crams as much meaning as possible in 160 chars, but rather hard to read.
  
 - SMS-mail:
    Sms-mail reads SMS messages from a GSM modem and passes them on as 
    email. For those of you who pass email on to your mobile phone via 
    your telco's mail-to-sms gateway, this completes the circuit, allowing 
    you to reply to the email from the mobile phone too.
  
 - Gnokii: an attempt
    to reverse-engineer the serial protocol used to interface with Nokia
    mobile phones.
  
 - Spk: Speakerphone program
    for use with voice-enabled modems.
  
 - Minicom:
    the debugging tool for anything serial.
  
 - SLSNIF:
    serial line sniffer. Listens to the specified serial port and logs
    all data flowing through it.
  
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