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Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.
100 Trying Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [1]: §21.1.1 180 Ringing Destination user agent received INVITE, and is alerting user of call.