Remove RFC 3261 18.1.2 sanity check (sent-by host mismatch in Via header). This allows JsSIP to interop with non very compliant RFC 3261 servers.
Remove RFC 3261 18.1.2 sanity check (sent-by host mismatch in Via header).
This allows JsSIP to interop with non very compliant RFC 3261 servers.

rusekr/JsSIP,CodeYellowBV/JsSIP,DrumTechnologiesLtd/JsSIP,tqcenglish/JsSIP,voxbone/JsSIP,dpocock/JsSIP,AaronZhangL/JsSIP,vconsult/JsSIP