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    One thing not mentioned that we do at work is the ability to selectively trace a transaction through our system. Our service looks up names associated with telephone numbers (along the call path [1]). We can enable a trace per telephone number, which is helpful for not only testing, but for troubleshooting an issue with a particular phone. And this can be enabled/disabled at any time by the operations team.

    [1] That is, as a call is being placed.

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      Logging & tracing are distinct concepts.