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Since triangular routing in mobile IP (MIP) is undesirable, MIP with route optimization (MIP-RO) and MIP with location registers (MIP-LR), all use binding updates that are sent directly to a correspondent host. session initiation protocol (SIP) based mobility management also uses direct binding updates between a mobile host and a correspondent host. However, this makes these protocols (except the basic MIP) vulnerable to the simultaneous mobility problem, i.e. the special case when both end hosts are mobile and move at about the same time. In this paper, we analyze the simultaneous mobility problem and propose new ways for MIP-LR and SIP to handle simultaneous mobility using a common approach stemming from a generalized solution.