A.IntServ ( Integrated Service )

B.FIFO ( First Input First Output )

C.Best Effort

D.DiffServ ( Differentiated Service )

A.Messages such as Setup and Connect are directly exchanged between the two terminals

B.H.245 capability negotiation is completed directly between two terminals

C.to the answers are right

D.Messages such as ARQ and ACF are directly exchanged between the two terminals

A.The frequency band of ADSL2 is twice that of ADSL

B.ADSL can support flexible bandwidth binding function, such as IMA ( Inverse Multiplexing forATM , ATM inverse multiplexing )

C.Compared with ADSL, ADSL2 adds a new operating mode

D.At the same transmission rate, ADSL2 can transmit longer distances than ADSL

A.not with PE on different devices the VPN of RD may be configured the same, in principle there are no conflicts

B.is not the same PE identical device on the VPN of RD must have the same, or they will not communicate

C.with a PE different from the VPN the RD not have the same

A.In addition to the external location request message, the calling UA other messages do not need to be forwarded through a proxy server

B.to the not right

C.behalf of the proxy server to help get the called UA after position, calling UA directly to the called UA initiates a call

D.Lord called UA all messages are forwarded through a proxy server