A SIP UA when started automatically gets all the necessary parameters and provides an indication that it is connecting to the server. However, after a short period, the SIP UA indicates that it is not useable. Which of the following is the FIRST thing to check?

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A SIP UA when started automatically gets all the necessary parameters and provides an indication that it is connecting to the server. However, after a short period, the SIP UA indicates that it is not useable. Which of the following is the FIRST thing to check?