Terminate the call and connect with alarmserver

Hei Hi guys,
i have an alarm-server and the alarm-server make a call to soft
voip or onother clients, and I will if 2 members is in a call and the alarm-server will be call one
of them member, the server have to terminate the call beetween members and
connect(Alarm-Server) with member for example 101 how can I implemant this, have the asterisk freepbx
this function ?

Thank you and best
regards

Murat

What exactly do you mean by “alarm-server” , and how is it implemented ?