Refer to the exhibit. The Saratoga Softball League is setting up Call Transfer for its Cisco Unified CallManager Express solution, which uses version 4.0. The network supports the H.450 standards. What will be used to execute the transfer? （） 
- A、Tcl script
- B、hairpin routing
- C、h.450.2 standard
- D、h.450.3 standard
- E、proprietary Cisco method
正确答案:E
答案解析:有
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