| 摘要 |
The invention relates to a control apparatus (AGNT), a telecommunication system (<u>SYS</u>), a control method and a subscriber sttion (<u>SS1</u>, TE, MT; <u>SS2</u>, TE, MT; <u>SS3</u>, TE, MT) wherein a call set-up request issued by a first subscriber station (<u>SS1</u>) is blocked from a transfer to a telecommunication network (NET) as long as the second subscriber station (<u>SS2</u>) to which a call should be set-up is in a busy state. The control apparatus (AGNT) only transfers the call set-up request to the exchange means (MSC/VLR, GMSC, HLR) of the telecommunication network (NET) when the called second subscriber station (<u>SS2</u>) changes from a busy state into an idle state. Thus, the network resources are not occupied by call set-up requests which would be rejected due to the second subscriber station (<u>SS2</u>) being in a busy state. The invention is particularly advantageous when the calling subscriber station (<u>SS1</u>) uses a re-dial function to repeat a call set-up request. After several retries further retries will be blocked and the call will only be set-up when the second subscriber station becomes free. A particular advantageous application of the invention is to combine the blocking of call set-up requests by the control apparatus (AGNT) with a CCBS service implemented in the network (NET).
|
