| 摘要 |
A UE ( 200 ) may establish various IMS Connections via various Access and Transport Networks ( 211 ). Each IMS Connection is associated with a specific contact address and all IMS connections are associated with a single specific Private User ID ( 229 ). Also various IMS connections may be established through different or identical P-CSCFs. For example, active IMS Connection ( 213 ) is associated with contact address 1 ( 203 ) and P-CSCF # 1 ( 215 ), while IMS Connection # 2 ( 217 ) is associated with contact address 2 ( 205 ) and P-CSCF # 2 ( 219 ). All IMS connections shown in FIG. 2 are via IPsec and are connected to S-CSCF ( 227 ). Therefore, at S-CSCF ( 227 ) the UE ( 200 ) is associated with one Private User ID ( 229 ) based upon the UE ( 200 ) ISIM ( 201 ). Thus in accordance with the embodiments, sessions may be moved between IMS connections and P-CSCFs which facilitates handoffs between various Access and Transport Networks ( 211 ).
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