If this cannot be automatically resolved, the calling user receives the congestion tone, also called reorder tone. For example, during the period of routing the call across the public switched telephone network (PSTN) the call may encounter congestion on a particular link. When a telephone user initiates a telephone call, typically by dialing or selecting a telephone number on a telephone, the progress or status of the call attempt is indicated to the user audibly by several types of call progress tones. With modern cell phone and smartphone technology ringing tone can be customized and even used for advertising. Various telecommunication groups, such as the Bell System and the General Post Office (GPO) developed standards, in part taken over by the European Telecommunications Standards Institute (ETSI) and other standards bodies. The tone is typically a repeated cadence similar to a traditional power ringing signal ( ringtone), but is usually not played synchronously.
Ringing tone ( audible ringing, also ringback tone) is a signaling tone in telecommunication that is heard by the originator of a telephone call while the destination terminal is alerting the receiving party.
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