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| Header Fields in SIP |
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Page 10 of 16
20.26 Priority
The Priority header field indicates the urgency of the request as
perceived by the client. The Priority header field describes the
priority that the SIP request should have to the receiving human or
its agent. For example, it may be factored into decisions about call
routing and acceptance. For these decisions, a message containing no
Priority header field SHOULD be treated as if it specified a Priority
of "normal". The Priority header field does not influence the use of
communications resources such as packet forwarding priority in
routers or access to circuits in PSTN gateways. The header field can
have the values "non-urgent", "normal", "urgent", and "emergency",
but additional values can be defined elsewhere. It is RECOMMENDED
that the value of "emergency" only be used when life, limb, or
property are in imminent danger. Otherwise, there are no semantics
defined for this header field.
These are the values of RFC 2076 [38], with the addition of
"emergency".
Examples:
Subject: A tornado is heading our way!
Priority: emergency
or
Subject: Weekend plans
Priority: non-urgent
