The games are playable on desktop, tablet and mobile. All content, information and/or links provided within this website or the site linking to this disclaimer, are offered only as general information.Mobile phones have been fully digital since the early 1990s second-generation ("2G") devices, hence are signaled to ring as part of the protocol they use to communicate with the cell base stations.While the sound produced is still called a "ring", more-recently manufactured telephones electronically produce a warbling, chirping, or other sound.This is the source of the name of the problem called "ring-trip" or "pre-trip", which occurs when the ringing signal on the line encounters excessively low resistance between the conductors, which trips the ring before the subscriber's actual telephone has a chance to ring (for more than a very short time); this is common with wet connections and improperly installed lines. This only applies to POTS fixed phones, where the high voltage ring signal is switched on and off to create the ringing pattern.
In smaller offices, special sub-cycle magnetic oscillators were used.
(SLC is a trademark of Alcatel-Lucent, but is often used generically.) Telephones with electromagnetic ringers are still in widespread use.
The ringing signal in North America is normally specified at ca. In Europe it is around 60–90 VAC with a frequency of 25 Hz.
In Australia and the UK, the standard ring cadence is 400 ms on, 200 ms off, 400 ms on, 2000 ms off.
These patterns may vary from region to region, and other patterns are used in different countries around the world.