Patent ID: 9241016
Filing Date: 2016-01-19
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A telecommunications device, comprising: an electronic memory to store at least a network address, a first random number code, and a second random number code; a sound unit to transmit the network address and the first and second random number codes via ultrasonic sound waves; a network interface to communicate via a data network using the network address; and a processor to establish a communication session, using the network address, for a teleconference with another device over the data network based upon receipt of a response from the other device via the data network, the response including at least the first random number code, wherein the processor is configured to measure a time elapsed from the receipt of the response and generate a warning message indicating that the terminal device is outside a permitted communication range for the teleconference when the time reaches a predetermined time before the second random number code is received by the telecommunications device.