Connector SOAP without external task or java class

Hi I am using following way to call web service endpoint but not working.
Url: Text =
payload: Script , Script Format: freemaker, Source Type: Inline Script
Script = <soap12:Envelope xmlns:xsi=“” xmlns:xsd=“” xmlns:soap12=“”>


<FahrenheitToCelsius xmlns="">





headers: Map = text/xml

I am not using any external delegate or java class
. I am trying to do this within camunda. Please let me know if anyone have done this.