Patent ID: 6577637
Filing Date: 2003-06-10
Classification: H04L,H04W

Abstract:
A method for performing data communications between a first subscriber station of a mobile radio communication network and a second subscriber station connectable to the mobile radio communication network, wherein at least the first subscriber station includes an audio data encoding/decoding means, comprising the following steps:a) sending a call set-up message from the first or second subscriber station to a switching means of the mobile radio communication network to set up a call between the first and second subscriber stations; b) determining on the basis of said call set-up message whether the second subscriber station is of a type also including an audio data encoding/decoding means, said determining step including: b1) accessing, by the switching means, an internal memory containing calling numbers, associated Internet Protocol (IP) addresses, and IP user names for subscriber stations in the network; and b2) comparing a calling number for the second subscriber station with the calling numbers, IP-addresses, and IP user names stored in the memory to determine whether the second subscriber station is of a type also including an audio data encoding/decoding means; c) setting up a call between the first and second subscriber station; d) switching off an audio data encoding/decoding means in said switching means, if the second subscriber station also includes an audio data encoding/decoding means; and e) encoding/decoding audio data at the first and second subscriber station using the respective encoding/decoding means and communicating said coded audio data through said switching means without applying an audio data coding/decoding thereto in said switching means.