Patent ID: 8228942

Claim:
A method of session initiation in a network system having at least one border and including devices having a first address type and devices having a second address type, comprising: receiving a session invite request from a calling user equipment; determining at decision making point at the border of the network whether the session invite request includes both the first and second address types, wherein the first address type is based on one of an IPv4 or an IPv6 protocol, and the second address type is based on the other of the IPv4 or the IPv6 protocol; and emulating, by a call session control function invoked by the decision making point, a dual stack user equipment, when the session invite request inductee one of the first and the second address types, but not the other of the first and second address types: wherein, the invite request after said emulating includes a first address group of the first address type, the first address group including a calling user equipment address, and a second address group of the second address type, the second address group including a called user equipment address.