Abstract: A call is setup between an originating device (A) and a terminating device (B), which both have access to a public land mobile network (131, 132) and a mobile data network (121, 122). The originating and terminating devices device (A; B) include a respective software-implemented call handling tool (SWA; SWB) configured to assist a user in placing and receiving calls. Bridge nodes (140) are connected to the mobile data network (121, 122), the public land mobile network (131, 132) and a server node (110), which also is connected to the mobile data network (121, 122). In response to a call-setup command from a user of the originating device (A), the software-implemented call handling tool (SWA), on one hand, sends a call-setup request (1) to the server node (110); and on the other hand, makes a first call (2) to a first bridge node (140) over the public land mobile network (131) using a first telephone number (#1).

Abstract: A group call is setup between one originating device (A) and at least two terminating devices (B, C), which each has access to a public land mobile network (131, 132, 133) and a mobile data net-work (121, 122, 123). The originating and terminating devices (A, B, C) include a respective software-implemented call handling tool (SWA, SWB, SWC) configured to assist a user in placing and receiving group calls. Bridge nodes (141, 142, 143) are connected to the mobile data network (121, 122, 123), the public land mobile network (131, 132, 133) and a server node (110), which, in turn, also is connected to the mobile data network (121, 122, 123).