For example, an operator may elect to provide an Emergency Alert System within
its own network as an additional service to its subscribers. To ensure its emergency
messages were routed as a high priority, it could implement the use of the PRIORITY
header. This would allow an operator to give a higher priority to its emergency messages
than it would to normal messages.
The RFC defines some suggested values for the PRIORITY header of ???normal,??? ???nonurgent,???
???urgent,??? and ???emergency.??? Their use is completely dependent on the operator,
although the IETF does recommend that the use of ???emergency??? be limited to lifethreatening
situations.
SUBJECT: Thunderstorm Warning for Johnston County
PRIORITY: Urgent
Proxy-Authenticate The PROXY-AUTHENTICATE header is provided as a challenge by
a proxy (such as an application server or a CSCF). When a request is sent by the device,
the proxy can send a 407 Proxy Authorization Required response, containing this header.
The device then must return a response containing the PROXY-AUTHORIZATION
header, with the proper credentials.
This could be used in cases where the operator wishes to authenticate a user every
time that user accesses its call control server, to prevent unauthorized access to a
server used to define call treatment and voicemail services by the subscriber.
PROXY-AUTHENTICATE: Digest Realm="tekelec.
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