| 摘要 |
The invention relates to a procedure for ensuring emergency calls in a wireless local loop in which subscriber's stations (MS) are connected over a radio link via a base station (BS) to an access node (AN) and from the access node to a local exchange (LE) of a wired telephone network, in which procedure the authentication process carried out in conjunction with call setup comprises establishing whether the call is to be initiated with a normal call start message or with an emergency call start message that is allowed to cause forced disconnection of another ongoing call having a lower priority in a known manner. A call initiated with a normal call start message is assigned top priority and a definition is made to the effect that forced disconnection of the call is not allowed and that the call is not allowed to cause the disconnection of another call, and the dialling information of the call is compared with a set of predetermined emergency numbers, and if the call is addressed to a number other than a predetermined emergency number, then the priority level of the call is lowered and forced disconnection of the call is allowed.
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