METHOD AND APPARATUS FOR PROVIDING A COMMUNICATION UNIT WITH A HANDOFF BETWEEN NETWORKS
First Claim
1. A method for providing a handoff of an ongoing call of a communication unit between an initial network and a second network, the method comprising:
- determining if the communication unit should switch from the initial network to the second network for obtaining service;
requesting the handoff of the ongoing call to the second network by sending a session initiation protocol message for a new call addressed to one of a public number associated with the communication unit and a private number associated with the communication unit, where the public number is a public switched telephone network (PSTN) number associated with an enterprise server; and
accepting the new call from the enterprise server over the second network.
2 Assignments
0 Petitions
Accused Products
Abstract
A communication unit (10) includes a mobility agent (225) for providing handoffs between a cellular network and a wireless local area network (11). The communication unit (10) determines if it should switch between the wireless local area network (11) and the cellular network for obtaining service, requests a handoff to the wireless local area network (11) or to the cellular network by sending a SIP message addressed to either a public number (229) or a private number (231) associated with the communication unit (10) upon making the determination. The communication unit (10) accepts a new call from an enterprise server (12) over the determined network. Corresponding methods of providing a hand-off is described.
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Citations
22 Claims
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1. A method for providing a handoff of an ongoing call of a communication unit between an initial network and a second network, the method comprising:
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determining if the communication unit should switch from the initial network to the second network for obtaining service;
requesting the handoff of the ongoing call to the second network by sending a session initiation protocol message for a new call addressed to one of a public number associated with the communication unit and a private number associated with the communication unit, where the public number is a public switched telephone network (PSTN) number associated with an enterprise server; and
accepting the new call from the enterprise server over the second network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for providing a handoff of an ongoing call of a communication unit between a first network and a second network, the method comprising:
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receiving a session initiation protocol message that includes a handoff request from the communication unit for the handoff of the ongoing call;
determining the second-network for providing services to the communication unit based upon the handoff request; and
placing a call to the communication unit on the second network and establishing a conference call between the communication unit and a target communication unit on the second network. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A communication unit with dual operating mode capability, the communication unit comprising:
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a mobility agent for generating a session initiation protocol message that includes a hand off request for an ongoing call between an initial network and a second network, wherein the session initiation protocol message is addressed to one of a public number associated with the communication number and a private number associated with the communication unit, where the public number is a public switched telephone network (PSTN) number associated with an enterprise server;
a receiver for determining when to switch to the second network to obtain service and for receiving a new call from the enterprise server over the second network; and
a transmitter for sending the session initiation protocol message to the enterprise server when it is determined to switch to the second network. - View Dependent Claims (19, 20, 21, 22)
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Specification