opal3.8.0，VoIP协议库，支持sip，h.323等，2010-02-01最新发布，支持多平台，如windows、linux-opal3.8.0, VoIP protocol library, support sip, h.323, etc. From 2010-02-01-date releases, support multiple platforms, such as windows, linux

VoiP call Recording solutions based on SIP message decoding

Async Professional is a comprehensive communications toolkit for Embarcadero/CodeGear Delphi for win32 targets. It provides direct access to serial ports, TAPI, and the Microsoft Speech API. It supports faxing, terminal emulation, VOIP, &