The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2009
Filed:
May. 13, 2004
Vikas Vashisht, Naperville, IL (US);
Anoop Tripathi, Lake Zurich, IL (US);
Jaideep Abichandani, Carol Stream, IL (US);
Hui Dai, Itasca, IL (US);
Vikas Vashisht, Naperville, IL (US);
Anoop Tripathi, Lake Zurich, IL (US);
Jaideep Abichandani, Carol Stream, IL (US);
Hui Dai, Itasca, IL (US);
3Com Corporation, Marlborough, MA (US);
Abstract
A method and apparatus for implementing a presence based universal camp-on feature in packet-based telephony systems are disclosed. A first packet-based device is subscribed to a line status of a second packet-based device. A first notification is received into the first packet-based device from the second packet-based device when the line status of the second packet-based device is in a busy state. A second notification is received into the first packet-based device from the second packet-based device when the line status of the second packet-based device is in an idle state. A user of the first packet-based device is prompted with an option to establish a communication session with the second packet-based device upon receiving the second notification into the first packet-based device. A communication session is established between the first packet-based device and the second packet-based device in response to receiving an accept-call command into the first packet-based device. The first packet-based device and the second packet-based device may be packet-based telephones, such as Session Initiation Protocol (SIP) telephones.