Here is a list of all documented files with brief descriptions:

[detail level 1234]

libsofia-sip-ua
iptsec
sofia-sip
auth_client.h	Client-side authenticator library
auth_client_plugin.h	Client-side plugin interface for authentication
auth_common.h	Functions common for client/server
auth_digest.h	Datatypes and functions for Digest authentication
auth_module.h	Authentication verification interface
auth_ntlm.h	Datatypes and functions for Ntlm authentication
auth_plugin.h	Plugin interface for authentication verification modules
iptsec_debug.h