Abstract: In one particular embodiment, surveillance information is determined from a surveillance system. The surveillance information provides information on an event being monitored by the surveillance system. It is determined if a virtual talk group should be created for the event. If so, the virtual talk group is created such that a plurality of users in the virtual talk group can communicate with each other in the virtual talk group.

Abstract: In one particular embodiment, surveillance information is determined from a surveillance system. The surveillance information provides information on an event being monitored by the surveillance system. It is determined if a virtual talk group should be created for the event. If so, the virtual talk group is created such that a plurality of users in the virtual talk group can communicate with each other in the virtual talk group.

Abstract: Providing announcements for communication sessions includes facilitating the communication sessions among endpoints comprising a half-duplex push-to-talk endpoint. It is established that a trigger event has occurred at the half-duplex push-to-talk endpoint, where the trigger event indicates an activity status of the half-duplex push-to-talk endpoint. One or more announcements associated with the trigger event are identified. The one or more announcements are provided to at least a subset of the endpoints.

Abstract: A method for communicating using position information includes communicating on a first communication network at a first location using one or more first communication parameters of the first communication network and, upon moving from the first location to a second location, receiving position information identifying the second location. The method includes adjusting the one or more first communication parameters to one or more second communication parameters based on the second location and communicating on a second communication network at the second location using the one or more second communication parameters.