Nextel Communications Inc.

Manish Sharma

Steven Wesley Barrow

Anthony Wei-Hsia Soong

Arun Manroa

Jing Qu

Michael Lee Lemish

Aaron Kumar Dhiman

Systems and methods for communicating presence information are provided. A communication station establishes a persistent connection with a proxy server and a temporary connection with a presence server. The temporary connection is established independent of the proxy server. The communication station provides and obtains presence information directly from the presence server over the temporary connection. After providing or obtaining information, the communication station terminates the temporary connection, while still maintaining the persistent connection with the proxy server.

Systems and methods for providing presence information

A method and computer-readable medium for precedence group calling in a dispatch station is provided. The method includes: receiving a precedence order for each of a plurality of group call originators, based upon a group call identifier of each of the plurality of group call originators; receiving a new group call from one of the plurality of group call originators; and automatically switching the dispatch station from a current group call to the new group call, if the group call identifier of the originator of the new group call has a higher precedence than the group call identifier of the originator of the current group call.

Method and computer-readable medium for precedence group calling

Systems and methods for obtaining location information for a communication station in a first domain by a communication station in a second domain are provided. The communication station in the second domain embeds a location request message in a message formatted according to a first communication protocol, and transmits the message formatted according to the first communication protocol to a proxy server. The proxy server removes the embedded request message and forwards it to a location server, which is located in the first domain. The proxy server receives a location response message and embeds it in another message formatted according to the first communication protocol. The proxy server then transmits the another message formatted according to the first communication protocol to the communication station in the second domain, which can remove the embedded location response message.

Systems and methods for providing location information

Systems and methods for enforcing calling restrictions are provided. When a first and second communication station are located in different domains, calling restrictions for a first communication station can be based on a current geographic location of the second communication station. The calling restrictions can be enforced independent of an address/identifier of the first or second communication station. The calling restrictions can be based on the current geographic locations of the first and second communication stations and the allowed geographic area of the first communication station.

Systems and methods for enforcing call restrictions between domains

Systems and methods for forwarding dispatch communications are provided. A dispatch communication forwarding request is sent to a dispatch processor or a dispatch communication forwarding server. A record associated with the dispatch station initiating the dispatch communication forwarding request is updated in a home location register to indicate that dispatch communications intended for the dispatch station should be forwarded to another dispatch station. The communication forwarding can be absolute such that all communications intended for one dispatch station are forwarded to another dispatch station. Alternatively, the communication forwarding can be conditional such that all dispatch communications meeting certain criteria intended for one dispatch station are forwarded to another dispatch station.

Dispatch communication forwarding

Methods and systems for IMEI registration are provided. In accordance with exemplary embodiments of the present invention, when an IMEI registration fails due to a network failure, the mobile station implements a back-off algorithm for future IMEI registration attempts. Specifically, the present invention provides a back-off algorithm which determines a different amount of time for the time period between each unsuccessful IMEI registration.

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Fairfax Station, VA, United States of America

Manish Sharma