A call admission control method performed by a visited policy and charging rule function, V-PCRF, in a visited wireless communication network that includes a femtocell that is coupled to the visited wireless communication network via a wireline communication network, wherein a user equipment is roaming from a home wireless communication network to the visited wireless communication network, comprising: receiving, at the V-PCRF in the visited wireless communication network, a request to initiate a call between the user equipment and the femtocell ; sending, by the V-PCRF to a resource admission control subsystem, RACS, of the wireline communication network, a request to allocate resources of the wireline communication network to provide a wired connection between the femtocell and the visited wireless communication network for the call between the user equipment and the femtocell ; wherein the wired connection includes a secure tunnel between the femtocell and the visited wireless communication network, and wherein receiving the request to initiate the call comprises receiving a session establishment message comprising an address of the secure tunnel and an identifier of the femtocell , wherein the address of the secure tunnel is received from a home subscriber server of the home wireless communication network; wherein the request to allocate resources of the wireline communication network for the call between the user equipment and the femtocell comprises the address of the secure tunnel and the identifier of the femtocell ; receiving, by the V-PCRF from the RACS information indicating whether the requested resources are available in the wireline communication network; and determining, at the V-PCRF , whether to admit the call based on the information received from the RACS . receiving, at the V-PCRF in the visited wireless communication network, a request to initiate a call between the user equipment and the femtocell ; sending, by the V-PCRF to a resource admission control subsystem, RACS, of the wireline communication network, a request to allocate resources of the wireline communication network to provide a wired connection between the femtocell and the visited wireless communication network for the call between the user equipment and the femtocell ; wherein the wired connection includes a secure tunnel between the femtocell and the visited wireless communication network, and wherein receiving the request to initiate the call comprises receiving a session establishment message comprising an address of the secure tunnel and an identifier of the femtocell , wherein the address of the secure tunnel is received from a home subscriber server of the home wireless communication network; wherein the request to allocate resources of the wireline communication network for the call between the user equipment and the femtocell comprises the address of the secure tunnel and the identifier of the femtocell ; receiving, by the V-PCRF from the RACS information indicating whether the requested resources are available in the wireline communication network; and determining, at the V-PCRF , whether to admit the call based on the information received from the RACS . <EOS>