Difference between AMPUSER and CALLERID(num) variable

What is the difference between the AMPUSER and CALLERID(num) variable?

${AMPUSER} it is not a channel variable that variable is related to FreePBX, you can see whe whole list of Asterisk variables here https://wiki.asterisk.org/wiki/display/AST/Asterisk+Standard+Channel+Variables

More precisely, it is a channel variable, but one that is set by FreePBX, not by the Asterisk binary. Either way, peer support for FreePBX comes from http://community.freepbx.org/ not from here.

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