A Multimedia system and a method in a Multimedia system where a first user with user equipment (1) uses a Push to talk service (PTT) to communicate with at least one second subscriber's user equipment (2) using said Push to talk service (PTT), wherein a PTT-server (3) providing the PTT-service interacts with said first and second subscriber's user equipment (1, 2) and exchanges information concerning relevant parameter values for each user equipment (1, 2), and each user equipment (1, 2) adapting its application settings during the operation of said PTT-service, whereby degradation of the perceived quality is prevented