The present document addresses QoS problems when interconnecting between existing technologies and LTE. The focus is on delay sensitive applications and the determination of possible shortcomings of the existing standards and possible shortcomings of known implementations at the time this report was produced. Furthermore@ possible solutions and future work are discussed. The present document concentrates on delay sensitive applications@ such as Voice over LTE (VoLTE) and Video Telephony over LTE (VToLTE) and the QoS associated with their interconnection with existing technologies. Interim solutions which are only meant to overcome the current lack of availability of IMS in many existing networks@ are in most cases not standardized@ but the available material is taken into account.