1. Outgoing number change in the S-CSCF is triggered by ( ).

2. From "Warning" Header, usually we can locate the first ENTITY which meet with the error.

3. The format of the Request_URI in an emergency call only can be the Tel URI.

4. ”Status-Code" and “Reason-Phrase" in a SIP response is very useful for troubleshooting, like “403 Forbidden”.

5. iFC data is stored in HSS and used by S-CSCF.

6. For the media troubleshooting, if both two sides cannot hear each other, what can be the possible reasons? ( ) (Multiple Choice)

7. In the third party registration, the parameter of Request_URI is S-CSCF address.

8. In Huawei's IMS Geographic Redundancy Solution, ( ) NE work in 1+1 mutual assistant mode. (Multiple Choice)

9. PBXs used in the Business Trunking service are classified into actual PBXs and virtual PBXs.

10. If the call has been forwarded for several times, the initial called number is named original called number.

11. The number route analysis refers to ( ) and ( ) in MGCF.

12. In the registration process, if the subscriber receives the "403 Forbidden" message from P-CSCF which contains the warning "Request From Untrusted Domain", the reason may be ( ). (Multiple Choice)

13. ( ) parameters can identify a dialog in IMS network. (Multiple Choice)

14. ConditionTypeCNF parameter in the iFC indicates the inter-group relationship among triggers.
The values are as follows:

15. During the DNS query process, the result of ( ) query contains the priority.

16. The HA management mode used in the OMU two-node cluster is cluster HA.

17. If the two UE don't contain the same codec, the call cannot be connected.

18. In the registration process, if the subscriber receives the 423 message from S-CSCF which contains the warning "Interval Too Brief", the reasons may be ( ).

19. If we can confirm SE2600 meet with some problems, usually we will check ( ). (Multiple Choice)

20. The Business Trunking solution, TDM-PBX access modes include ( ). (Multiple Choice)