| 摘要 |
A system generates a change in the SIP INVITE message during a call transfer. Here, a user relation element (URE), such as an IP Multimedia Subsystem (IMS) Serving Call Session Control Function (S-CSCF), a Smart Common Input Method (SCIM) function, a proxy/registrar/location server or a feature sequencer, involved in the call can change the header information in the message to include the endpoint view of the transferring party. Thus, the INVITE message is redirected to the transferring party's URE, which can interpret the received message and "unravel" the B2BUAs in the existing call path. The system includes changes in the URE to effect the message change and interpret the message once received. Changes to the URE forgo the need to change the communication endpoints. |
