A method for supporting session control in an IMS domain of a communications network, the method comprising the following steps in a control node (108, 200, 400, 600) for controlling centralized services and service continuity in the IMS domain: - storing (304, 504, 704) a session information item (218, 418, 618) comprising a user identity (222, 422, 622) for a user device involved in the session and a first identifier (216, 416, 616) identifying the user device in a CS domain of the communications network, wherein the first identifier comprises at least one of an MSISDN (216, 416), an IMSI, and a GRUU; and - receiving (306, 506, 706) a transfer request, wherein the transfer request comprises a second identifier (226, 426, 626) identifying a user device in the CS domain; characterized in that: the storing step is performed for each of a plurality of ongoing communication sessions, wherein the user identity is associated with multiple user devices, the transfer request is a session transfer request (224, 424, 624), and the second identifier comprises at least one of an MSISDN, an IMSI (426, 626), and a GRUU, the method further comprising the steps of: - comparing (308, 510, 708) a third identifier determined based on the second identifier with the stored plurality of first identifiers; and - identifying (310, 512, 710), based on the comparison, a particular ongoing session related to the requested session transfer by determining a session number for a session for which the third identifier matches with the first identifier. - storing (304, 504, 704) a session information item (218, 418, 618) comprising a user identity (222, 422, 622) for a user device involved in the session and a first identifier (216, 416, 616) identifying the user device in a CS domain of the communications network, wherein the first identifier comprises at least one of an MSISDN (216, 416), an IMSI, and a GRUU; and - receiving (306, 506, 706) a transfer request, wherein the transfer request comprises a second identifier (226, 426, 626) identifying a user device in the CS domain; the storing step is performed for each of a plurality of ongoing communication sessions, wherein the user identity is associated with multiple user devices, the transfer request is a session transfer request (224, 424, 624), and the second identifier comprises at least one of an MSISDN, an IMSI (426, 626), and a GRUU, the method further comprising the steps of: - comparing (308, 510, 708) a third identifier determined based on the second identifier with the stored plurality of first identifiers; and - identifying (310, 512, 710), based on the comparison, a particular ongoing session related to the requested session transfer by determining a session number for a session for which the third identifier matches with the first identifier. - comparing (308, 510, 708) a third identifier determined based on the second identifier with the stored plurality of first identifiers; and - identifying (310, 512, 710), based on the comparison, a particular ongoing session related to the requested session transfer by determining a session number for a session for which the third identifier matches with the first identifier.