Technology embodied in a method that includes receiving a first data packet associated with a first IMS session or transaction between a first UE and an IMS over an IP network, and determining, based on information included in the first data packet, that an
IP address of the first UE is included in a
list of IP addresses stored at the IMS module. The IMS module is configured with the
list that represents UEs deemed to receive priority service, and the IP addresses are assigned by a
Packet Core Network, to the UEs during set-up of corresponding IMS PDU sessions. The method further includes responsive to determining that the
IP address of the first UE is included in the
list of IP addresses stored at the IMS module, routing and
processing the first data packet over a first set of network resources configured to provide the priority service.