Answer Posted / siva subrahmanyam

After we attempt a new call from our mobile then to connect
this call to the destination, the service provider has to
get the line free that is he has to find the carrier
first.. if he finds so, then he will forward the call.. If
he doesn't senses the carrier immediately, then the call
could not be forwarded.. so, a message will come telling
that all the lines to the route dial by you are busy.. That
means some other customer may be in the same line talking
to the same destination or some other user.. This could be
the reason for the network busy message.

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