Techniques are provided for managing the provisioning of voice services to a user equipment (UE) in a fifth generation (5G) network by a base station (BS). For example, the BS receives an initial registration request message that includes 5G mobility management (5GMM) capabilities of the UE that are indicative of whether the UE supports voice over internet protocol multimedia subsystem (IMS), and compares the 5GMM capabilities of the UE and the capabilities of the BS. Based on the comparison, the BS can transmit a registration accept message including an indication of whether voice over IMS is approved.