An application server generates a script and transmits the script to a first user equipment. The script is transmitted to the first user equipment in a request for establishment of a communication session between the first user equipment and a second user equipment. Execution of the script by the first user equipment controls handling of the communication session between the first user equipment and the second user equipment. Thus, by sending the script to the first user equipment, the application server controls the manner in which the first user equipment handles the communication session.