1	Software\Microsoft\Conferencing
2	Software\Microsoft\Conferencing
3	1
4	0
5	.\MCATPSTN.INI
6	MCAT\PSTN
257	DIAL REQUEST FAILED
258	MODEM INITIALIZATION FAILED
259	CONNECT REQUEST FAILED
260	NETWORK UNAVAILABLE
261	NETWORK BUSY
262	RING DETECTED
263	DEVICE CONFIGURATION ERROR
264	DEVICE INITIALIZATION FAILED
265	DEVICE UNAVAILABLE
266	DEVICE IN USE
267	CARRIER DETECT SIGNAL GLITCHED
268	CARRIER DETECT SIGNAL HIGH
269	LOST CARRIER DETECT SIGNAL
270	NO LOGICAL CONNECTIONS
271	FATAL ERROR - ILLEGAL PACKET RECEIVED
272	FATAL ERROR - RECEIVE SEQUENCE EXCEPTION
273	FATAL ERROR - REMOTE SITE TIMED OUT