Method for detecting calls and corresponding units

Abstract

A method for detecting calls is disclosed. A call request initiated by a calling terminal device is received by an access unit of a called terminal device of a data packet transmission network. An invite message is sent from the access unit to the called terminal device. A 200-OK message from the called terminal device is received by the access device. In the event of a detection request, a detection message is received by the access unit in order to initiate a detection of the calling terminal device. Additionally, a telephone terminal device includes a controller, which responds with a 200-OK to an invite message, the terminal device sends a detection message to the access unit in order to initiate a detection of a calling terminal device. An access unit which automatically stores an identifier of a calling terminal device is also disclosed.

1 . A method for detecting calls, comprising:
 receiving a call request, which is initiated by a calling terminal device, by an access unit of a called terminal device of a data packet transmission network;   sending an invite message, in accordance with the session initiation protocol, from the access unit to the called terminal device, the sending in response to receiving the call request;   receiving a first 200-OK message, in accordance to the session initiation protocol, by the access device, the first 200-OK message sent from the called terminal device in response to the invite message; and   in the event of a detection request, receiving a detection message by the access unit in order to initiate a detection of the calling terminal device, the detection message sent by the called terminal.   
   
   
       2 . The method according to  claim 1 , further comprising:
 performing the detection of the calling terminal is done in the access unit.   
   
   
       3 . The method according to  claim 1 , further comprising:
 sending a second 200-OK message, in accordance to the session initiation protocol, from the access device in the direction of the calling terminal device.   
   
   
       4 . The method according to  claim 1 , wherein
 an identifier of the calling terminal device is stored in a memory, the memory resides in the access unit or the access unit initiates the storing of memory outside the access unit.   
   
   
       5 . The method according to  claim 4 , wherein
 the identifier is a subscriber number of the calling terminal device is stored in the memory based on the detection message.   
   
   
       6 . The method according to  claim 1 , wherein
 the calling terminal device is a terminal device of a circuit-switched data transmission network.   
   
   
       7 . The method according to  claim 1 , wherein
 the access unit checks the access authorization of the calling terminal device for the data packet transmission network.   
   
   
       8 . The method according to  claim 4 , wherein
 at least one data selected from the group consisting of identifier of the called terminal device, date, and time-of-day is stored in addition to the identifier of the calling terminal device.   
   
   
       9 . A telephone terminal device for a data packet transmission network, comprising:
 a controller, which responds to a session-initiation-protocol invite message initiated via a call from a calling terminal device, the response being a session-initiation-protocol 200-OK message, which is sent to an access unit, wherein   in the event of a detection request, the terminal device sends a detection message to the access unit in order to initiate a detection of the calling terminal device.   
   
   
       10 . An access unit for a data packet transmission network, comprising:
 a control unit, which automatically stores an identifier of a terminal device calling a called terminal device.   
   
   
       11 . The access unit according to  claim 10 , wherein the identifier is automatically stored after the reception of a detection message.