0	1	0	invite	100 R: Invite/100 Trying
1	2	1	empty	180	-/ 180 ringing, Set Timer B
1	0	0	bye	200	R: bye / error
2	3	0	offhook	0		U: Offhook
2	0	0	bye	200	R: bye / error
3	5	1	empty	200	-/ 200 OK, Set Timer D
3	0	0	bye	200	R: bye / error
5	0	0	bye		200	R: Bye/200 OK
5	7	0	ack	empty	R: Ack / -
7	0	0	bye	200	quit media