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To its mobile telephone business customers BT Group provides a 1571 Voicemail service, which is similar to the service provided to landlines. Calling parties can leave messages when the mobile telephone is switched off, when it is in an area of reduced coverage, when it is on another call, or when the call is not answered within a fixed number of rings.
In the United Kingdom, a warbling signal sounding rather like an alarm siren is played at steadily increasing volume to a telephone left off-hook and unused on telephone lines provided by the BT Group and many PABX extensions. It is sometimes referred to as a howler. In some cases it is composed of the DTMF tones * and # played alternately.
The VoIP replacement is known as "Digital Voice" (on a BT service) in the UK. France, Germany and Japan are also in the process of replacing theirs. [20] By means of porting, voice over IP services can host landline numbers previously hosted on traditional fixed telephone networks. VoIP services can be used anywhere an internet connection is ...
In practice, such charging rates applied only from BT lines and calls typically cost 16p per minute from non-BT landlines and up to 45p per minute from mobile telephones. In 1999, landline providers started to offer "inclusive" call packages where calls to 01 and 02 numbers were free. Within a few years most customers were on this type of plan.
Up to 4.26p a minute (plus VAT), but fixed (e.g. always 3p/minute or always 4p/minute) from BT landline, other providers may charge more; up to 42p a minute from mobiles. 0843 xxx xxxx 0844 00x xxxx Non-BT Discount Scheme—Internet Services incorporating unmetered access up to and including 5p for BT customers 0844 01x xxxx to 0844 09x xxxx
A soft dial tone or express dial tone may be used when no actual service is active on a line, and normal calls cannot be made. It is maintained only so that an attached phone can dial the emergency telephone number (such as 911, 112 or 999), in compliance with the law in most places.
As in many other countries, the United Kingdom is retiring its part of the global circuit-switched public switched telephone network. [1] [2] [3]British Telecom, the country's dominant telco, announced its intention to switch off its PSTN infrastructure by December 2025, including both copper baseband landline telephone connections and its ISDN network. [2]
A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call.