Patent ID: 7529556

Claim:
A method of creating a temporary site dependent push-to-talk/media (PTT/M) group for allowing PTT/M communications among a visiting PTT/M equipped mobile device and site based PIT/M equipped devices while the visiting PTT/M equipped mobile device is on-site wherein the PTT/M equipped devices operate on one or more inter-communicable PTT/M networks, the method comprising: detecting when a visiting PTT/M equipped mobile device is physically located on-site; registering the visiting PTT/M equipped mobile device with the site based PTT/M equipped devices and the site based PTT/M equipped devices with the visiting PTT/M equipped mobile device such that normal group PTT/M communications can take place, the registering comprising: automatically associating a pre-defined timeout period with the visiting PTT/M equipped mobile device: on a site based PTT/M equipped devices PTT/M network server, adding the visiting PIT/M equipped mobile device ID; and on a visiting PTT/M equipped mobile device PTT/M network server, adding site based PTT/M equipped device IDs; detecting when a visiting PTT/M equipped mobile device goes off-site; de-registering the visiting PTT/M equipped mobile device with the site based PTT/M equipped devices and the site based PTT/M equipped devices with the visiting PTT/M equipped mobile device when the PTT/M equipped mobile device goes off-site, the de-registering comprising: on the site based PTT/M equipped devices PTT/M network server, removing the visiting PTT/M equipped mobile device ID; and on the visiting PTT/M equipped mobile device PTT/M network server, removing the site based PIT/M equipped device IDs; wherein two-way PTT/M communications are allowed among the visiting PTT/M equipped mobile device and the site based PTT/M equipped device while the visiting PTT/M equipped mobile device is physically on-site, and wherein the visiting PTT/M equipped mobile device will be de-registered after the pre-defined timeout period when it cannot be detected when the visiting PTT/M equipped mobile device has gone off-site.