Concept of an application based on multiple services

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Call List of IC:123456
call 1 from a to b Start time: 12:32:00 End time: 12:34:00
call 2 from a to b (with a video song Start time: 12:32:00 End time: 12:34:00
call 3 from a to b Start time: 12:32:00 End time: 12:34:00
call 4 from b to c Start time: 12:32:00 End time: 12:34:00
call 5 from d to b Start time: 12:32:00 End time: 12:34:00
call 6 from e to b Start time: 12:32:00 End time: 12:34:00