Signalling mode of the group: multicast : all assigned terminals are called simultaneously chainNoRepeat : All assigned terminals are called in the sequence of their entry in configuration. chainRepeat : This call is a special case of the linear call. After all terminals are called, call signalling begins again with the first entered terminal. growing : The terminals are called in the sequence of their entry in the subscriber list. Every terminal that has already been called is called again, until all entered terminals are called. chainNoRepeatWithMulticastTimer: chainNoRepeat + after defined times have run out, all team subscribers can be called in parallel. chainRepeatWithMulticastTimer : chainRepeat + after defined times have run out, all team subscribers can be called in parallel. maxIdle : Even distribution corresponds to 'chainRepeat' and ensures that all team subscribers receive the same number of calls call-center : for call-center application.