extensions.conf:
[globals]

VERBOSE1=$ ${UNIQUEID} ${EXTEN} ${CHANNEL} ${CONTEXT}
VERBOSE2="${UNIQUEID} ${EXTEN} ${CHANNEL} ${CONTEXT}"
VERBOSE3=${UNIQUEID} ${EXTEN} ${CHANNEL} ${CONTEXT}
VERBOSE4=\${UNIQUEID} \${EXTEN} \${CHANNEL} \${CONTEXT}
VERBOSE5=$\{UNIQUEID} $\{EXTEN} $\{CHANNEL} $\{CONTEXT}


pbx-1*CLI> extensions reload
  == Setting global variable 'VERBOSE1' to '$ ${UNIQUEID} ${EXTEN} ${CHANNEL} ${CONTEXT}'
  == Setting global variable 'VERBOSE2' to '"   "'
  == Setting global variable 'VERBOSE3' to '   '
  == Setting global variable 'VERBOSE4' to '\ \ \ \'
  == Setting global variable 'VERBOSE5' to '$\{UNIQUEID} $\{EXTEN} $\{CHANNEL} $\{CONTEXT}'