Systems and methods are provided for improving the overall experience for users conducting voice calls over 5G, despite experiencing an adverse status or failure of IMS registration. Particularly, after a voice call is initiated via a user equipment (UE) device over 5G NR, a status of an IMS registration (e.g., failed, in progress, etc.) for the UE is identified. Thereafter, voice call handling functions may be adjusted in a manner that is deemed most efficient and reliable for completing the voice call based on the identified status. For example, in response to determining that the status of IMS registration for the UE is in-progress, the voice call can be held, and a wait timer initiated. If the IMS registration completes prior to the wait timer expiring, the voice call is conducted over 5G NR or 4G Long-term Evolution (LTE).