In some implementations, a core network device can receive an initiation request of a communication session to an alias number. The core network device can retrieve from a registration database one or more destination number(s) corresponding to the alias number. The core network device can transmit respective indication(s) of the alias number to destination(s) corresponding to the retrieved destination number(s). The core network device can initiate the communication session to one of the destination(s) using the respective one of the retrieved destination number(s). A destination number can correspond to a computing device, e.g., user equipment, configured to answer calls originating from an alias number that is different from the destination number, by receiving an intent message indicating the alias number, transmitting an acknowledgement, subsequently receiving an invitation message directed to the destination number for a communication session with another device, and transmitting an acceptance message to the other device.