Last come, first served treatment of communication session requests

A method comprising:

• receiving, by a terminating user equipment (UE), a first session request to establish a first communication session with the terminating UE;
• initiating, by the terminating UE, first setup procedures to establish the first communication session;
• and
• prior to establishing the first communication session:
• receiving, by the terminating UE, a second session request to establish a second communication session with the terminating UE;
• sending, by the terminating UE, a response indicating that the first setup procedures have been stopped;
• and
• initiating, by the terminating UE, second setup procedures to establish the second communication session.

A method comprising:

• receiving, by a terminating user equipment (UE), a Session Initiation Protocol (SIP) message for establishing a first communication session with the terminating UE;
• initiating a first session setup, by the terminating UE, for the first communication session;
• and
• prior to completing the first session setup for the first communication session:
• receiving, by the terminating UE, a notification message for establishing a second communication session with the terminating UE;
• terminating, by the terminating UE, the first session setup;
• and
• initiating, by the terminating UE, a second session setup to establish the second communication session.