H11-861-ENU

For FEC, When both parties establish a call and the packet loss in media stream exceeds 0.1% within 10s, the FEC function is enabled. FEC separates some bandwidth from the call bandwidth to transmit anti-dropping redundant stream. ( )A . TRUEB . FALSEView AnswerAnswer: A

Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. ()A . TRUEB . FALSEView AnswerAnswer: B

RFC2190 defines three formats for H.263 payload header: modes A, B, and C. Mode A is recommended and also the most common one. ()A . TRUEB . FALSEView AnswerAnswer: A

The three frame types in H.264 are ().A . A, Q, PB . B, I, PC . C, Q, BD . T, C, BView AnswerAnswer: B

After you define the open logical channel on a private network terminal inside a firewall, if (), the media streams can be transmitted in one direction only.A . The firewall does not have the relevant port enabled.B . The private IP address cannot be found for media stream transmission.C ....

NAT works at the ().A . Data link layerB . Network layerC . Application layerD . Transport layerView AnswerAnswer: B

In RTCP packet, Sender report (SR) used for transmission and reception statistics from sending gateways. ( )A . TRUEB . FALSEView AnswerAnswer: A

RFC 3550 defines () RTCP packet types to carry a variety of control information.A . 3B . 4C . 5D . 6View AnswerAnswer: B

MCU Video Firewall Mode has advantages, but it also has limitation, such as (). (Select 3 answers)A . The MCU supports communication between only two networks. The communication among more than two networks, however, is not supported.B . The GE0 port must register with a GC . The GE1 port...

Audio signals can be encoded in the following modes. () (Select 3 answers)A . Waveform codingB . Forecast codingC . Parameter codingD . Hybrid codingView AnswerAnswer: ACD