Systems and methods to virtually and securely extend voice, data, and
video services as well as applications on communication networks is
provided. An access gateway device is used to provide interworking and
extension of services from an enterprise network or a hosted enterprise
network to a public network such as an IP Multimedia Subsystem (IMS)
network. The access gateway device can also enable handoffs between an
enterprise access point and the service provider's radio network while
maintain the user's session. The access gateway can also extend services
from the enterprise network to the service providers network and vice
versa.