SYSTEM AND METHOD FOR ROUTING COMMUNICATIONS TO MOBILE STATIONS
First Claim
Patent Images
1. A method of transmitting information in a network comprising:
- at a Session Initiation Protocol (SIP)-compliant proxy;
receiving a first INVITE message destined for a mobile station, the first INVITE message being associated with an initial Internet Protocol (IP) contact address for the mobile station;
subsequently determining whether an IP address update for the mobile station has occurred and obtaining a new IP contact address for the mobile station; and
sending a second INVITE message to the mobile station at the new contact address so as to continue a session initiation.
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Accused Products
Abstract
A Session Initiation Protocol (SIP)-compliant proxy (106) receives a first INVITE message destined for a mobile station (102). The first INVITE message is associated with an initial Internet Protocol (IP) contact address for the mobile station (102). Subsequently, it is determined whether an IP address update for the mobile station (102) may have occurred and a new IP contact address is obtained for the mobile station (102). A second INVITE message is sent to the mobile station (102) at the new contact address so as to continue a session initiation.
20 Citations
20 Claims
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1. A method of transmitting information in a network comprising:
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at a Session Initiation Protocol (SIP)-compliant proxy; receiving a first INVITE message destined for a mobile station, the first INVITE message being associated with an initial Internet Protocol (IP) contact address for the mobile station; subsequently determining whether an IP address update for the mobile station has occurred and obtaining a new IP contact address for the mobile station; and sending a second INVITE message to the mobile station at the new contact address so as to continue a session initiation. - View Dependent Claims (2, 3, 4, 5)
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6. A method of transmitting information in a network comprising:
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at a mobile station; operating at and receiving communications at a first Internet Protocol (IP) address; acquiring a second IP address, the second IP address being a new operating address of the mobile station; registering the second IP address at a Session Initiation Protocol (SIP)-compliant registrar and subsequently receiving an INVITE message; subsequent to registering the second IP address, initializing an IP stack at the mobile station to use the second IP address; and preventing an occurrence of a race condition at the mobile station because of the mobile station operating at the second IP address. - View Dependent Claims (7, 8, 9, 10)
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11. A Session Initiation Protocol (SIP)-compliant proxy comprising:
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a receiver having an input that receives a first INVITE message destined for a mobile station, the first INVITE message having an initial Internet Protocol (IP) contact address; a transmitter having an output; and a controller coupled to the receiver and the transmitter, the controller being programmed to determine whether an address update has occurred and to responsively obtain a new IP contact address for the mobile station, the controller being further programmed to responsively send a second INVITE message to the mobile station at the output of the transmitter, the second INVITE message associated with the new IP contact address so as to continue a session initiation. - View Dependent Claims (12, 13, 14, 15)
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- 16. A mobile station that is configured to operate at and receive communications at a first Internet Protocol (IP) address, acquire a second IP address, the second IP address being a new operating address of the mobile station, register the second IP address at a Session Initiation Protocol (SIP)-compliant registrar and subsequently receive an INVITE message, subsequent to registering the second IP address, initialize a stack at the mobile station to use the second IP address, and prevent an occurrence of a race condition at the mobile station because of the mobile station operating at the second IP address.
Specification