Refer to the wxhibit . what QOS model should be used to reserve the requested bandwidth and delay needed for each allowed VOIP call regardless of changing networkconditions？（） 
- A、best-effort delivery
- B、ingress committed rate （ICR）
- C、shaping and policing
- D、egress committed rate （ECR）
- E、integrated Services （IntServ）
- F、differentiated services （DiffServ）
正确答案:E
答案解析:有
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