is rising significantly. According to the 2018 Ericsson Mobility Report (https://www.ericsson. com/491e17/assets/local/mobility-report/documents/2018/eri obility-report-june-2018.pdf),VoLTE subscriptions are projected to reach 5.4 billion in 2023, which means that the service providers will be implementing more IMS deployments for VoLTE Voice over New Radio (VoNR) services. The same IMS architecture can also be employed for VoNR services when a service provider deploys a 5G network. therefore, leveraging existing IMS deployments will be a key driver for VoNR. 5G system service requirements The 3rd Generation Partnership Project (3GPP) technical specification (TS) 22.261 service requirements for the 5G system brings different requirements to the efficient speech and video user plane, media rate adaptations, augmented reality (AR), virtual reality (VR), extended reality (XR) or mixed reality (MR) services, holographic communications, and telepresent robotics. These are related to 5G system service requirements, and 5G networks need to be able to accommodate some of these different services with VoNR deployments. Therefore, the need for VoNR deployments will grow. Ultra-high-definition audio VoNR employs ultra-high-definition audio through the Enhanced Voice Services (EVS) codec and its extension of Immersive Voice and Audio Services (IVAS). This ultra-high-definition audio is fundamentally used for voice calls. Furthermore, it will integrate with applications and contents, such as announcements, music, conferencing, and real-time communications, leveraging VoNR. VoNR high-level architecture There are three main components associated with the VoNR architecture. These are the 5G New Radio (NR) access network, 5G core network (5GC), and IP multimedia subsystem. 5G NR access and core networks 5G NR access and core networks transport call signaling and voice packets. Call signaling is performed as a Session Initiation Protocol (SIP). SIP is the control signaling used between the device and the IMS to initiate, maintain,