Secondary dialtone
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A secondary dialtone, or second dialtone, is a dialtone-like sound presented to the caller after a call has already been set up. Secondary dialtones are often used in call queuing and call forwarding systems.
Unlike a normal dialtone, a secondary dialtone is provided when a connection has already been established, and typically costing money to the call originator. Systems using secondary dialtone have been criticized for misleading callers into thinking that they are still waiting for a call to be set up.
