Over the past years there has been a rapid rise of the mobile communications industry which, combined with the limitations of the current communications networks' structure, necessitates the development of new networks with increased capabilities, so that users can be served with optimal quality of service and network resources utilization. Software Defined Networking (SDN) is a networking approach which transforms the network elements to simple forwarding devices, making decisions centrally. The quality of service perceived by the user, or Quality of Experience (QoE), is considered to be a matter of great importance in software defined networks. This paper presents the SDN QoE Monitoring Framework (SQMF), an SDN application that monitors and preserves the QoE for VoIP and video applications, by periodically monitoring various network parameters and using QoE estimation models.