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A call detail record (CDR) is a data record produced by a telephone exchange or other telecommunications equipment that documents the details of a telephone call or other telecommunications transactions (e.g., text message) that passes through that facility or device. The record contains various attributes of the call, such as time, duration ...
An intermediary machine or process rejected the call attempt. [25] This contrasts with the 607 (Unwanted) SIP response code in which a human, the called party, rejected the call. The intermediary rejecting the call should include a Call-Info header with "purpose" value "jwscard", with the jCard [26] with contact details. The calling party can ...
SIM Application Toolkit (STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...
MetroPCS Communications (NYS: PCS) carries $2.5 billion of goodwill and other intangibles on its balance sheet. Sometimes goodwill, especially when it's excessive, can foreshadow problems down the ...
Metro: Metro by T-Mobile: Operational: MVNO: Former MetroPCS; CDMA2000 1900 / CDMA2000 1700 shut down in 2015; LTE 1700 merged with T-Mobile US [131] 311: 670: Pine Belt Wireless: Pine Belt Cellular Inc. Operational: LTE 700: Alabama; [131] CDMA shut down [194] 311: 680: GreenFly LLC: Unknown: GSM 1900: Iowa [131] [77] 311: 690: TeleBEEPER of ...
Call flow for the mobile terminated Short Message Service. The figure to the right depicts a call flow for mobile-terminated Short Message delivery. [1] For the sake of simplicity, some of the interactions between the VMSC and VLR, and VMSC and Handset, have been omitted, and only the case when SMS home routing is not in use is shown.
In some cases, a SIM-locked handset is sold at a substantially lower price than an unlocked one, because the service provider expects income through its service. SIM locks are employed on cheaper (pay-as-you-go) handsets, while discounts on more expensive handsets require a subscription that provides guaranteed income. Unlocked handsets have a ...
Customer proprietary network information (CPNI) is the data collected by telecommunications companies about a consumer's telephone service. [1] It includes the time, date, duration and destination number of each call, the type of network a consumer subscribes to, and certain other information that appears on the consumer's telephone bill. [2]