extensions.conf:

exten => TMP, 1, NoOp{"${CALLERID(num)}")


also tried:

exten => TMP, 1, NoOp{"${CALLERID(NUM)}")
exten => TMP, 1, NoOp{"${CALLERID(name)}")


CLI output:
Executing NoOP("Zap/1-1", """") in new stack