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You are troubleshooting a SIP routing issue and you have access to the SIP call...

You are troubleshooting a SIP routing issue and you have access to the SIP call flow processed by the Session Border Controller.

Which two steps are valid for troubleshooting this type of issues? (Choose two.)

A.

It is necessary to locate the SIP session to troubleshoot and check if there is a 404 Routes Not Found SIP error message.

B.

It is recommended to look for 183 Session Progress SIP error messages that indicate routing issues.

C.

It is recommended to check the called number by looking at the Request-URI of the INVITE message and making sure it is a valid number to be routed.

D.

It is recommended to find the CANCEL method received by the Session Border Controller which typically identifies a SIP routing issue.

E.

It is necessary to find an initial INVITE received by the Session Border Controller which gets a 503 Service Unavailable SIP error message.

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