Fixed interoperability with AVP. 
Fixed interoperability with AVP. 

"mid" attribute isn't required when SDP contains only one audio m-line

http://groups.google.com/group/unimrcp/browse_thread/thread/8118f8ab3003a28d?pli=1
MattRiddell/unimrcp,AaronZhangL/unimrcp,andrenatal/unimrcp,andrenatal/unimrcp,AaronZhangL/unimrcp,MattRiddell/unimrcp,MattRiddell/unimrcp,pgaval/unimrcp,andrenatal/unimrcp,pgaval/unimrcp,AaronZhangL/unimrcp,pgaval/unimrcp