Transitioning of a packet-switched emergency call between first and second types of wireless access networks
A mobile station that is initially attached to a first type of wireless access network is involved in a packet-switched emergency call. Upon detection of transitioning of the mobile station, a message is sent indicating transitioning of the mobile station from the first type wireless access network to the second type wireless access network to cause the packet-switched emergency call to be performed over the second type wireless access network.
Microsoft Technology Licensing, LLC
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Yi Jun Ke-Chi
Song Li Jang