1. The following description about FEC advantages and disadvantages, which is correct? (Choose two answers)

2. What is the main role of H.245 protocol? (Choose two answers)

3. Which of the following can achieve Video codec protocol?

4. When you forget the HD end-user name and password and cannot log on to the Web interface, you can only restore the factory settings.

5. The nature's frequency response ability that the human ear can perceive can reach 20Hz-20KHz, using G.711, G.722, G.728 and other audio standard. The audio width is only 50Hz-7KHz. So using AAC-LD way solves this problem in high definition video communication process.

6. Background color take the skin color's complementary color, and avoid large areas skin color's adjacent color or similar color; generally use the blue, gray, blue-gray combined tones and others; large line's background pattern make the picture look simple and clear.

7. RFC2190 defines three kinds of formats payload header in total for the H.263 video codec formats, namely: Mode A, Mode B and Mode C. A mode is recommended and typically used transmission mode.

8. In H.460 signaling interworking scenario ( ).

9. Which of the followings belong to extension request? (Choose 3 answers)

10. RRJ send to [（218.5.64.98:18616）] [59285094444]

[[0x00000065:err_reg_wrong_account_or_passwork]]

From the above logs, what is the registration failure reason?