Annotated edit history of
ShortMessageService version 2, including all changes.
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ShortMessageService ([SMS]) is the transmission of short text messages to and from a mobile phone, fax machine and/or IP address. Messages must be no longer than 160 alpha-numeric characters and contain no images or graphics. |
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Once a message is sent, it is received by a ShortMessageService Center (SMSC), which must then get it to the appropriate mobile device. |
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To do this, the SMSC sends a [SMS] Request to the home location register (HLR) to find the roaming customer. Once the HLR receives the request, it will respond to the SMSC with the subscriber's status: 1) inactive or active 2) where subscriber is roaming. |
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If the response is "inactive", then the SMSC will hold onto the message for a period of time. When the subscriber accesses his device, the HLR sends a [SMS] Notification to the SMSC, and the SMSC will attempt delivery. |
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Compare [MMS]. |
