The invention relates to a method of routing a call made by a calling party to a fixed telephone number of a called party, said method comprising: —checking if the called party is a subscriber to a routing service; —if the called party is a first subscriber: checking if the first subscriber is located in a first area covered by one or more wireless access points; —checking if the calling party is a subscriber to said routing service; —if the calling party is a second subscriber: checking if the second subscriber is located in a second area covered by one or more further wireless access points; —routing said call to one or more mobile terminals associated with said fixed number via an IP network and one of said wireless access points in the case wherein said first subscriber is located in said first area or both said first subscriber and said second subscriber are located in their respective first and second areas, or otherwise routing said call to a predetermined alternative terminating point. A specific Service Control Point is arranged to store a list that comprises alternative terminating points for the calls to the fixed number.