no se eso de protocolo rtp.. pero encontre referencias
a voip,
si es para voip,,
aqui hay unos componentes
http://www.torry.net/quicksearchd.ph...=voip&Title=No
Async Professional v.4.07 Alpha 2 FWS 5793 Kb 05 Jul 2006
By Turbo Power Software. Async Professional is a comprehensive communications toolkit for Borland Delphi, C++Builder, and ActiveX environments. It provides direct access to serial ports, TAPI, and the Microsoft Speech API. It supports faxing, terminal emulation, VOIP, and more.