| 摘要 |
In an optimal routing, a mobile-terminating call is routed from the PLMN of the A party directly to the PLMN currently visited by the B party (MSB). According to the invention, in order to avoid double allocation of roaming numbers in the optimal routing, the A party PLMN first requests information on the location of the B party (2, 3). Only if it is detected, on the basis of this location information, that the optimal routing is allowed will the actual routing information request be carried out (4, 7), which causes a roaming number to be allocated for the call in the visited network (5, 6). If it is decided that optimal routing be not carried out, but the call is routed to the B party home network, the routing information request will not be carried out until at the home network. In the second embodiment of the invention, routing information requests are carried out as in the prior art, but the A subscriber PLMN mobile communication network causes the release of the roaming number thus allocated if it decides not to carry out optimal routing and routes the call to the home network. |
