PBXs may use a method called in-band signaling to control their station sets. In-band signals use the same band of frequencies as the audio signal; this is usually accomplished with touch-tone signals. This method provides a limited amount of integration because there are no standards and different PBXs provide varying levels of control. Call progress tones that even similar models send can vary. This means that applications, even on identical PBXs, have to be tuned with each installation.
An example of in-band signaling is transferring a call using the flashhook method There is no data (e.g., caller ID information) passed along when the call is transferred.
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