Data-Only Emergency Calls
2019
RFC 6443 'Framework for Emergency Calling Using Internet
Multimedia' describes how devices use the Internet to place
emergency calls and how Public Safety Answering Points (PSAPs) handle
Internet multimedia emergency calls natively. The exchange of
multimedia traffic for emergency services involves a Session
Initiation Protocol (SIP) session establishment starting with a SIP
INVITE that negotiates various parameters for that session. In some
cases, however, the transmission of application data is all that is
needed. Examples of such environments include alerts issued by a
temperature sensor, burglar alarm, or chemical spill sensor. Often
these alerts are conveyed as one-shot data transmissions. These type
of interactions are called 'data-only emergency calls'. This
document describes a container for the data based on the Common
Alerting Protocol (CAP) and its transmission using the SIP MESSAGE
transaction.
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