| 摘要 |
A first node (110, 115, 135, 200) for an IP connection with a second node over an A interface between a Access Network (101) and a Circuit Switched Core Network (122), said IP connection comprising an RTP and an RTCP connection. The first node has an RTP address comprising an IP address and a UDP port in the RTP connection and can change its RTP address and signal said change by a message to the second node (200, 135, 110, 115) over the RTCP connection and receive an ACK message. The first node is arranged to, following said change of RTP address, receive user plane data over the RTP connection from the second node at its changed and unchanged RTP address and to initiate an Internal handover with Mobile Switching Centre support if said ACK message from the second node is not received within a time limit.
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