Possibly, your provider requires that you send 66819433885 or +66819433885 instead of 0819433885. Of course, if calling from softphone or IP phone works when dialing 0819433885, that’s not your issue.
pjsip set logger on
is an Asterisk command, not a shell command. From a root shell prompt, type
asterisk -r
and you should get a prompt similar to
freepbx*CLI>
where you can type
pjsip set logger on
If the command was received properly, you should see
PJSIP Logging enabled
Also, please post the settings that worked in your softphone or IP phone. Hide any personal information such as usernames, phone numbers and passwords, by replacing them with (for example) uuuu, nnnn and pppp.