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...http://www.google.com.tw/patents/US7428422?utm_source=gb-gplus-share專利 US7428422 - Method and system for setting application settings for a push-to-talk service
