service
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... 1]) is a system that uses DNS
(Domain Name Service, RFC 1034std13 [8]) to translate telephone numbers ...
... URIs to identify resources.
Presence is a service defined in RFC 2778 [2] that allows users of a
...
... 2778 [2] that allows users of a
communications service to monitor one another's availability and
disposition in order to make decisions about communicating. Presence
information is highly dynamic and generally characterizes whether a
...
... The IETF has defined a generic URI used to identify a presence
service for a particular resource: the 'pres' URI scheme (defined in
CPP ...
... ENUM Service Registration ...
... document:
Service name: "E2U+pres"
...
... presence states associated with telephones, or presence of non-
telephony communications services advertised by ENUM.
...
... they have an ongoing association. As an example, consider how this
might apply to a telephony service. Most cellular telephones today
have an address book ...
... availability of his or her associates.
The presence information that is shared varies by communications
service. The IETF has defined a Presence Information Data Format (or
...
... PIDF is an extensible
format, and new sorts of statuses can be defined for specific
communications services. For example, a telephony-based presence
service might define a status corresponding to 'busy'. Extending
PIDF ...
... format, and new sorts of statuses can be defined for specific
communications services. For example, a telephony-based presence
service might define a status corresponding to 'busy'. Extending
PIDF for telephony services ...
... presence
service might define a status corresponding to 'busy'. Extending
PIDF for telephony services is, however, outside the scope of this
document.
...
... [10]) contains a string composed of two subfields: a 'protocol'
subfield and a 'resolution service' subfield. ENUM in particular
defines an 'E2U ...
... URI scheme. Other URI schemes appropriate to presence services MAY
be used; however, the use of the 'pres' URI scheme ensures a greater
...
... presence protocol. The purpose of a pres URI is to
provide a generic way to locate a presence service. Techniques for
dereferencing the pres URI ...