What is ringback tone

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Tech moves fast! Stay ahead of the curve with Techopedia! Ringback tones are actually a throwback to circuit-switched phone networks such as PSTN Public Switched Telephony Network abbreviations explained here , when these tones helped indicate that a connection had been initiated. Callers have come to expect a ringback tone when making a phone call both at home and abroad.

The specific tone is often location-dependent, for example, in the case of calling from the UK to Spain, a Spanish ringback tone will be heard. Ringback tones are not generated by the device being called, but by the service provider or network.

In the case of VoIP phone systems , ringback tones aren't necessarily required, but they are created to maintain the user experience callers expect when making calls. They are known as "extension headers" and help generate the various tones. These commands set the frequency, rhythm and duration of the tone, with each country having their own unique ringback sound. The first of these headers is the "Country" SIP header which specifies the country where the phone number is located. This header is made up of the following parameters, with the country represented by a two-letter country code eg 'fr' for France:.

The second header is the "Ringback" SIP header. This is where the frequency and cadence of the tone are specified. This header is made up of the following parameters:.