Invoked by the pro_close_indication callback to indicate the disposition of a request to close a channel.
Invoked by the pro_close_indication callback to indicate the disposition of a request to close a channel.To accept, the diag parameter should be NULL; otherwise, this parameter should explain why the request was declined.
If the request is accepted, the profile should wait for the pro_close_confirmation callback to be made to indicate the final disposition of the request. Until that time, the profile should stop sending MSGs, but should continue processing any traffic it receives.