########### 3 #########
CASE#7 a eq not control 
m=audio 5555 RTP/AVP 7
a = conol : rtsp://zippy.cs.columbia.edu

CASE#8 a eq control:
m=audio 5555 RTP/AVP 8
a = control:rtsp://zippy.cs.columbia.edu

CASE#9 a eq control space :
m=audio 5555 RTP/AVP 9
a = control :rtsp://zippy.cs.columbia.edu

CASE#10 a eq control no :
m=audio 5555 RTP/AVP 10
a = control rtsp://zippy.cs.columbia.edu

CASE#11 a eq control:
m=audio 5555 RTP/AVP 11 
a = control: 

m =audio 5555 RTP/AVP 12 
a=control:rtsp://zippy.cs.columbia.edu