The SimpleIAX offers most of the IAXClient library features. Just in radically simplified form. The following is a quota from IAXClient home http://iaxclient.wiki.sourceforge.net/.

Although Asterisk supports other VOIP protocols (including SIP, and with patches, H.323), IAX's simple, lightweight nature gives it several advantages, particularly in that it can operate easily through NAT and packet firewalls, and it is easily extensible and simple to understand.

Iaxclient pulls together the wide array of open source technologies required for telephony applications:

• speex - high quality audio codec optimized for human speech
• gsm - another popular codec for speech
• theora - open source video codec
• portaudio - cross platform audio capture and output
• libiax2 - inter-asterisk exchange protocol library for handing network communication
• libvidcap - cross platform video capture