| 摘要 |
A presence agent ( 100 ) for a telephone line ( 102 ) operable to provide telephony presence information to a presence client. A line monitor ( 104 ) is included for collecting line status information by monitoring a telephone line associated with the telephone. A presence entity module ( 108 ) is coupled to the line monitor for processing the line status information into presence data operable to be transmitted over an IP-based network ( 110 ).
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