He called the emergency management agencies including the state units and FEMA. They were too busy to call back.

FORBES: Mobile Solar Generators - One Man's Odyssey to Bring Power Back to New York

Patients requiring routine appointments or test results are asked to wait a few days or call back at less busy times.

BBC: Why GP surgeries need crowd control

And when I call them, they are often busy, and we get a message saying that we have to call back later on.

WHITEHOUSE: President Obama Talks Jobs in Allentown

Mr.Holzman told me that when they tried to call her back, her line was busy.

FORBES: Bono, Bloomberg And Sir Paul Top A List Of Ten Highest Celebrity Auctions For 2012

During busy periods the call handler will agree a time for an adviser to ring back, within a three-hour timeframe.

BBC: NHS Direct Wales 'turned off' for 999 calls, Unison claims