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So this is how my Pivot looks like, I want to change it to override caller_id number with value '+115500000' for example:

 "{\"module\":\"set_variables\", \"data\":{\"custom_application_vars\":{\"XD\":\"$xdf\",\"XD-EXTENSION\":\"$xdf_extension\",\"XD_CALLER_ID\":\"$caller_id\"}},
 \"children\":{\"_\":{\"module\":\"resources\", 
 \"data\":{
   \"use_local_resources\":false,
      \"custom_sip_headers\":{
                \"user_caller_id_number\":\"{caller_id_number}\",
                \"user_caller_id_name\":\"{caller_id_name}\",
                \"X-account-id\":\"{account_id}\",
                \"X-Member\":\"{caller_id_name}\",
                \"X-XD\":\"$xdf\",
                \"X-XD_EXTENSION\":\"$xdf_extension\",
                \"X-XD_CALLER_ID\":\"$caller_id\"
   
}}}}}"

Any ideas?