DO you mean this service
Enter a numeric value, xx
x i.e. of the following values: xx
x NO (0) xx
x YES (1) xx
x xx
x Preempter xx
x YES: this trunk group supports the preemption service. xx
x Reminder: when there is a priority call, if the conditions so allow, xx
x preemption makes it possible to release resources in order to set up the xx
x call. These resources may be released in routing (channel B for example) or xx
x on arrival (set).