iMOS: enabling VoIP QoS monitoring at intermediate nodes in an OpenFlow SDN

The growing popularity of outsourced enterprise VoIP services poses a significant quality assurance issue for service providers. VoIP traffic is very sensitive to network impairments and maintaining high QoS across multiple domains can be challenging. We propose to use SDN and our implementation of intermediate VoIP call quality measurement to provide an advanced VoIP monitoring service. Our solution can automatically detect and locate quality issues for VoIP traffic.