Problem with appsthey are entering

Why I get this error when making an incoming call and how to resolve it

Please use plain text logs, from the log files, and use at least verbosity 3.

The PJSIP_HEADER diagnostic is not really an error, although, together with other things, it indicates you need to urgently plan to upgrade to chan_pjsip.

The cause 20 error typically means you are trying to call an extension that has not registered.

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