Hi Madhu,
1)The call in B network will be disconnected/releaseased by the B MSC when a certain timer (Txxxx) will expire. So, this call will NOT increment the DropCall counters in B network.
2)No, will be considered a dropped call just in A network.
3)Not sure, probably some sort of “Txxxx timer expired” or “MSC channel release”… maybe…
Hope this is useful to you.