This Recommendation is intended to provide guidelines concerning the key aspects impacting end-to-end performance of carrier-grade (in opposition to over-the-top approaches, which are outside of the scope here) conversational video services over LTE networks, also known as ViLTE, as defined by the Global System for Mobile communications Association (GSMA) in [b-GSMA IR.94]. It more so identifies the preconditions for an optimally operating ViLTE network and in conclusion provides remedial measures that operators can leverage to address the associated impact of QoS degradations in the LTE network.