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The most common mobile keypad alphabet layout. Short Message Service ( SMS) is a service component of most,, and. It uses standardized to enable mobile devices to exchange short text messages.
An intermediary service can facilitate a text-to-voice conversion to be sent to landlines. SMS was the most widely used data application, with an estimated 3.5 billion active users, or about 80% of all mobile subscribers, at the end of 2010. SMS, as used on modern devices, originated from in radio memo pagers that used standardized phone protocols. These were defined in 1985 as part of the Global System for Mobile Communications (GSM) series of standards. [ ] The protocols allowed users to send and receive messages of up to 160 alpha-numeric characters to and from GSM mobiles. Although most SMS messages are mobile-to-mobile text messages, support for the service has expanded to include other mobile technologies, such as ANSI CDMA networks and.
SMS is also employed in, a type of. According to one market research report, as of 2014, the global SMS messaging business was estimated to be worth over $100 billion, accounting for almost 50 percent of all the revenue generated by mobile messaging. Main article: The Short Message Service—Point to Point (SMS-PP)—was originally defined in GSM recommendation 03.40, which is now maintained in as TS 23.040. GSM 03.41 (now 3GPP TS 23.041) defines the Short Message Service—Cell Broadcast (SMS-CB), which allows messages (advertising, public information, etc.) to be broadcast to all mobile users in a specified geographical area. Messages are sent to a (SMSC), which provides a ' mechanism. It attempts to send messages to the SMSC's recipients.
If a recipient is not reachable, the SMSC queues the message for later retry. Some SMSCs also provide a 'forward and forget' option where transmission is tried only once.
Both mobile terminated (MT, for messages sent to a mobile handset) and mobile originating (MO, for those sent from the mobile handset) operations are supported. Message delivery is ',' so there are no guarantees that a message will actually be delivered to its recipient, but delay or complete loss of a message is uncommon, typically affecting less than 5 percent of messages. Some providers allow users to request delivery reports, either via the SMS settings of most modern phones, or by prefixing each message with *0# or *N#. However, the exact meaning of confirmations varies from reaching the network, to being queued for sending, to being sent, to receiving a confirmation of receipt from the target device, and users are often not informed of the specific type of success being reported. [ ] SMS is a in which every SMS message is considered entirely independent of other messages.
Enterprise applications using SMS as a communication channel for stateful dialogue (where an MO reply message is paired to a specific MT message) requires that be maintained external to the protocol. Andam Serial Wiki. Eton Camera Driver Download Free. [ ] Message size [ ] Transmission of short messages between the SMSC and the handset is done whenever using the (MAP) of the protocol. Messages are sent with the MAP MO- and MT-ForwardSM operations, whose payload length is limited by the constraints of the signaling protocol to precisely 140 (140 bytes * 8 bits / byte = 1120 bits). Short messages can be encoded using a variety of alphabets: the default,, and the 16-bit alphabet.
Depending on which alphabet the subscriber has configured in the handset, this leads to the maximum individual short message sizes of 160 7- characters, 140 8-bit characters, or 70 16-bit characters. GSM 7-bit alphabet support is mandatory for GSM handsets and network elements, but characters in languages such as Hindi, Arabic, Chinese, Korean, Japanese, or Cyrillic alphabet languages (e.g., Russian, Ukrainian, Serbian, Bulgarian, etc.) must be encoded using the 16-bit (see ). Data and other is additional to the payload size.
[ ] Larger content (, multipart or segmented SMS, or 'long SMS') can be sent using multiple messages, in which case each message will start with a (UDH) containing segmentation information. Since UDH is part of the payload, the number of available characters per segment is lower: 153 for 7-bit encoding, 134 for 8-bit encoding and 67 for 16-bit encoding. The receiving handset is then responsible for reassembling the message and presenting it to the user as one long message. While the standard theoretically permits up to 255 segments, 6 to 8 segment messages are the practical maximum, [ ] and long messages are often billed as equivalent to multiple SMS messages. Some providers have offered length-oriented pricing schemes for messages, although that type of pricing structure is rapidly disappearing. [ ] Gateway providers [ ] SMS gateway providers facilitate SMS traffic between businesses and mobile subscribers, including SMS for enterprises, content delivery, and entertainment services involving SMS, e.g. Considering SMS messaging performance and cost, as well as the level of messaging services, SMS gateway providers can be classified as aggregators or providers.
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