Issues in supporting multimedia services in SIP networks with mixed endpoint types. - Maria R. G. Azada; James A. Calme; Richard P. Ejzak; John J. MacNamara (Bell Labs Tech. J., 2004)

Seamless mobility across IMS and legacy circuit networks. - Maria R. G. Azada; Richard P. Ejzak; John J. MacNamara; Donna M. Sand; Robin Thompson (Bell Labs Tech. J., 2006)