invite refactoring & add auth & add empty sdp

Invite SDP Initial commit
BYE invite_to change_account
conflicts
SDP hardcode

BYE invite_to change_account
fix conflicts
outbound proxy test support
init commit
andtoid logs changes
Incoming sound (outcoming invoice), very dirty code. need refactoring
Create CallEngine for execute sip commands
Incoming call engine done
nothing change
layout changes
fixing conflicts