作者andyliu (飙仔猫)
看板PangSir
标题[讨论] 期末考重点参考解答
时间Thu Jan 5 20:09:05 2006
1.Please elaborate on the principles of integration on SIP and QoS mechanisms.
2.STUNPlease describe how STUN works for most NATs.
Please describe why STUN can not work on Symmetric NAT.
Please describe “Binding Lifetime Determination” in STUN.
Ans:VoIP+NAT.pdf p.36、p37、p41
3.Please describe the advantages of separation of media and call control.
Ans:Media_Gateway_Control.pdf P.22
4.You are asked to design a SIP-to-PSTN gateway based on MGCP. Draw the network architecture and describe the message flow for a SIP terminal calling a telephone on PSTN.
Ans:Media_Gateway_Control.pdf P.11
5.Describe the issues discussed in IETF SIGTRAN
Ans:SS7.pdf p.14
6.Describe the concepts of Soft-switch, and compare Softswitch with existing “Hard/Circuited”-switch
Ans:Media_Gateway_Control.pdf P.13
7.In what scenario will Softswitch be a selection for VoIP service?
8.Design a VoIP Network
What is the blocking probability? How to calculate it?
Which factors does the required bandwidth for a single call depend on?
Ans:chap9.pdf p.11
剩余/有错的部份请其他人帮忙补上/指正吧，谢啦~~
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