Patent ID: 7535892
Filing Date: 2009-05-19
Classification: H04M

Abstract:
1. A Voice over Internet Protocol (VoIP) system having a dynamic gain control function and a communication path between a first terminal, the first terminal being an extension telephone of a private exchange, and second terminal of a type operating according to an Internet protocol, the communication path comprising a VoIP gateway connected to said private exchange, and a gatekeeper connected between said VoIP gateway and the second terminal, said VoIP system comprising: said private exchange including a gain table of gain values and transmitting one of said gain values to said VoIP gateway; and said VoIP gateway receiving the gain value from the private exchange, storing the gain value, amplifying PCM voice data transmitted from the private exchange according to the stored gain value, transforming the amplified PCM voice data into a VoIP packet, transmitting the VoIP packet to said second terminal, transforming VoIP packets transmitted from the said second terminal into transformed PCM voice data, amplifying the transformed PCM voice data according to the stored gain value, and transmitting the amplified PCM voice data to said first terminal of the private exchange.