Patent ID: 6731937
Filing Date: 2004-05-04
Classification: H04M,H04N

Abstract:
A control apparatus (AGNT) for controlling the set-up of calls between a first subscriber station (TE, MT, SS1) and a second subscriber station (TE, MT, SS2) which are connected to a telecommunication network (NET), comprising:a) a recall detection means (RC-DET) for checking if a received call set-up request relates to a call set-up for which a previous call set-up request has already been issued by said first subscriber station (TE, MS1, SS1); b) a call set-up request blocking means (RC-BLK) for blocking said received call set-up request issued by the first subscriber station (TE, MS1, SS1) to set up a call to the second subscriber station (TE, MS2, SS2) from being transferred to the exchange means (GMSC, MSC/VLR, HLR) of the telecommunication network (NET); and c) an activation means (BLK-ACT) for activating said call set-up request blocking means (RC-BLK) when said second subscriber station (TE, MS2, SS2) is in a busy state.