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

[detail level 123]

src
api
api.c
api.h	API endpoints
http_status.h	HTTP status code constants
server.c
server.h	HTTP API server
command
cli.c
cli.h	Command line interface
commands.c
commands.h	Commands
parser.c
parser.h	Command parser
db
pib.c
pib.h	Policy Information Base
trib.c
trib.h	Telephony Routing Information Base
enum
dns.c
dns.h	DNS protocol header
enum.c
enum.h	ENUM emulation query interface
functions
locator.c
locator.h	Peer locator
manager.c
manager.h	Session manager
session.c
session.h	Session logic
logging
logging.c
logging.h	Logging utilities
protocol
protocol.c
protocol.h	Protocol definition header
tripd
tripd.c	Main entry point
util
util.h