Method for managing a call of a terminal in a telecommunications system offering a call routing and location service; said telecommunications system comprising firstly a call centre and secondly at least one first and one second telecommunications subsystem that are connected to one another (10, 20); a first location function being associated with the first telecommunications subsystem and a second location function, different from the first location function, being adapted to cooperate with the call centre; said call centre being connected to the second telecommunications subsystem; said method comprising the following steps: /a/ in the first subsystem: - routing a call initiation message, received from said terminal, to the call centre, via the second telecommunications subsystem; and - providing the first location function with an identifier of the terminal included in the call initiation message; /b/ in the first location function, determining location information of the terminal, associated with the identifier of the terminal provided by the first subsystem, and then transmitting the location information to the second location function, wherein the second location function is a global location function; and wherein the call centre requests the location information from this global location function, wherein, when the telecommunications system comprises a plurality of call centres, a routing function is adapted to select, on the basis of routing assistance information received from the terminal, a call centre for routing the call initiation message, and wherein the routing assistance information corresponds to information relating to the type of network access, which is indicated in the call initiation message, wherein the second location function is associated with the second subsystem; and wherein the second location function is determined on the basis of the call centre. /a/ in the first subsystem: - routing a call initiation message, received from said terminal, to the call centre, via the second telecommunications subsystem; and - providing the first location function with an identifier of the terminal included in the call initiation message; - routing a call initiation message, received from said terminal, to the call centre, via the second telecommunications subsystem; and - providing the first location function with an identifier of the terminal included in the call initiation message; /b/ in the first location function, determining location information of the terminal, associated with the identifier of the terminal provided by the first subsystem, and then transmitting the location information to the second location function, wherein the second location function is a global location function; and wherein the call centre requests the location information from this global location function, wherein, when the telecommunications system comprises a plurality of call centres, a routing function is adapted to select, on the basis of routing assistance information received from the terminal, a call centre for routing the call initiation message, and wherein the routing assistance information corresponds to information relating to the type of network access, which is indicated in the call initiation message, wherein the second location function is associated with the second subsystem; and wherein the second location function is determined on the basis of the call centre.