GSMLIB is a library to access GSM mobile phones through GSM modems. Features include: modification of phonebooks stored in the mobile phone or on the SIM card, reading and writing of SMS messages stored in the mobile phone, sending and reception of SMS messages. Additionally, some simple command line programs are provided to use these features.
oRTP is a library implementing the Real-time Transport Protocol (RFC3550), written in C. It is easy to use and provides a packet scheduler for sending and receiving packets on time, adaptive jitter compensation, automatic sending of RTCP compound packets, and the RTCP parser API. It works with IPv6.
The SMSj library allows you to send SMSes (GSM) from the Java platform. It gives you full control over the SMS including the UDH field so you can create and send EMS messages, Nokia ringtones, and images. It provides a pluggable transport layer that allows it be used with a range of different SMS servers.
PHP Voice (formerly known as PHP VXML) contain four classes that assist in developing voice application using PHP. It supports Speech Synthesis Markup Language 1.0, Speech Recognition Grammar Specification 1.0, Voice Browser Call Control: CCXML 1.0, and Voice Extensible Markup Language (VoiceXML) 2.0.
MMS Diary is a mobile phone weblog/diary for use when you are on holiday. It uses MMS (Multimedia Messaging Service) as a transport to upload texts and photos to your homepage. This is done with a PHP script that pretends to be an MMS proxy relay (the server that receives MMS messages is sometimes also referred to as MMSC).
CT Server is a Perl module that interfaces with Voicetronix computer telephony cards, giving developers a method of creating quick and creative computer telephony applications. A complete PBX is included as an example, which includes a Web interface for configuring and monitoring the PBX.