Displaying calling subscriber number in call set-up

A method of transferring the identity of subscriber A to a second centre serving a mobile station of subscriber B roaming in a visited network in a telecommunication system which further comprises or is connected to a first centre and an intelligent network service control point, in which method the first centre receives a call set-up request from subscriber A and in response thereto determines the identities of subscriber A and subscriber B and the address of the second centre,

• characterized by
• the first centre sending to the service control point an intelligent network service initiating message,
• the service control point sending to the second centre information indicating the identity of subscriber A and that a call is incoming to subscriber B,
• the second centre sending to subscriber B's mobile station information indicating the identity of subscriber A and that a call is incoming to subscriber B,
• the second centre receiving from subscriber B's mobile station a response and sending it to the service control point, and
• the service control point analyzing the response and issuing in response thereto necessary call set-up instructions to the first centre, which sets up a call to subscriber B's mobile station if said response indicates that subscriber B accepts said call.