# include Directory Reference

## Directories

directory | codec
directory | ep
directory | h224
directory | h323
directory | h460
directory | iax2
directory | im
directory | lids
directory | opal
directory | rtp
directory | sip
directory | t120
directory | t38

## Files

file | opal.h [code]
| This file contains a simplified API to the OPAL system. It provides a pure "C" language interface as will as a very simple C++ class and a contrained set of functions for "late binding".