Method for setting up a communication, implemented on a communication management device, comprising: - reception of a first message from a first communication device, said first message being a message to initiate a communication to a second communication device, the first and second communication devices each having a main call identifier, said first message comprising: • identification information associated with the first communication device previously stored in the communication management device, • the main call identifier of the second communication device, - a search for an association between the main call identifier of the second communication device and an intermediate call identifier (IADn) that is a function either of the main call identifier of the second communication device contained in the message received, or of a communication service associated with the communication to be routed, - if an association is found, • selection (ST4a) of said intermediate call identifier as call identifier dedicated to the communication to be routed, via said intermediate call identifier, to said second communication device, • sending (ST6a) to the first communication device of a message containing said intermediate call identifier associated with said main call identifier of the second communication device, • interception (ST7a-ST9a) of a call from the first communication device to the intermediate call identifier, then routing (ST10a) of the call to the main call identifier of the second communication device, by using a secondary call identifier of the first communication device, the secondary identifier having previously been correlated with the identification information associated with the first communication device, - if no association is found, sending (ST4b) to the first communication device of a message indicating the absence of association, to trigger a call from the first communication device to the main call identifier of the second communication device, by using the main call identifier of the first communication device. - reception of a first message from a first communication device, said first message being a message to initiate a communication to a second communication device, the first and second communication devices each having a main call identifier, said first message comprising: • identification information associated with the first communication device previously stored in the communication management device, • the main call identifier of the second communication device, • identification information associated with the first communication device previously stored in the communication management device, • the main call identifier of the second communication device, - a search for an association between the main call identifier of the second communication device and an intermediate call identifier (IADn) that is a function either of the main call identifier of the second communication device contained in the message received, or of a communication service associated with the communication to be routed, - if an association is found, • selection (ST4a) of said intermediate call identifier as call identifier dedicated to the communication to be routed, via said intermediate call identifier, to said second communication device, • sending (ST6a) to the first communication device of a message containing said intermediate call identifier associated with said main call identifier of the second communication device, • interception (ST7a-ST9a) of a call from the first communication device to the intermediate call identifier, then routing (ST10a) of the call to the main call identifier of the second communication device, by using a secondary call identifier of the first communication device, the secondary identifier having previously been correlated with the identification information associated with the first communication device, • selection (ST4a) of said intermediate call identifier as call identifier dedicated to the communication to be routed, via said intermediate call identifier, to said second communication device, • sending (ST6a) to the first communication device of a message containing said intermediate call identifier associated with said main call identifier of the second communication device, • interception (ST7a-ST9a) of a call from the first communication device to the intermediate call identifier, then routing (ST10a) of the call to the main call identifier of the second communication device, by using a secondary call identifier of the first communication device, the secondary identifier having previously been correlated with the identification information associated with the first communication device, - if no association is found, sending (ST4b) to the first communication device of a message indicating the absence of association, to trigger a call from the first communication device to the main call identifier of the second communication device, by using the main call identifier of the first communication device.