1. In H.323 protocol, opening the logical channel follows the rule of "who want to transmit, who open it". ()

2. 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. ( )

3. In Multi-channel Cascading, the prioritie at using the multiple channels is ().

4. The methods for scheduling a conference that supports recording include (). (Select 3 answers)

5. Wireshark supports packet decoding for various protocols, include (). (Select 3 answers)

6. Over an H.460 network, private video terminals connect to () in the SETUP phase.

7. A Network Diagnostician remotely instructs another Network Diagnostician to initiate a diagnostic test to a network diagnostician in another network. ( )

8. In Multi-channel Cascading, the protocols of all multi-channel conference sites must be consistent, but band widths can be different. ( )

9. An MCU belongs to one service areas. A service area can have multiple MCUs. ( )

10. If two MCUs are cascaded to hold a conference, the MCUs join the conference as virtual sites. ()

11. Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. ()

12. Multicast allows one or multiple senders (multicast sources) to send one data packet to multiple receivers at a time. ( )

13. MCUs assigned to the same service area must share a prefix. ()

14. The six call steps of H.323 apply to all H.323 terminals. ()

15. In Videoconferencing room the reason Why the illuminance cannot be too low is because the camera generates significant white noises under low illuminance using CCD or CMOS. ( )

16. The NLog is part of SMC, Huawei’s conference management software. ()

17. A video terminal on a private network (video terminal A) uses the IP address 10.1.0.10, the static NAT outbound address is 61.1.0.10, and the GK IP address is 61.1.0.11. A video terminal on a public network (video terminal B) uses the IP address 61.1.0.12. Video terminal B can dial ( ) to call video terminal A.

18. Users can dial the MCU IP address and follow the IVR instructions to create a conference. ()

19. For INVITE transaction, messages are retransmitted at intervals of () by default.

20. The To tag, From tag, and Call-ID define the SIP relationship between the user agent client (UAC) and user agent server (UAS), which refers to a dialog. ()