Tech support job is like a calling job?

as I am a production engineer, in a field of engineering technical support job is not like a calling job. both are major differences. for a calling job you don't need a wide knowledge of products and process of engineering you just  need good communication skills and  basic knowledge of products and their firms and most important convincing  skill but as a technical support team member, you need a wide knowledge of products and its design, the process of manufacturing,  a calling  job is an indoor job while in a tech support job  you need to visit working sites