I do not know an OOB solution to suppress error messages. There is a parameter in ar.conf for warnings and information, but not for errors.
However, an HTTP error code 502 is also a real error in the application you are calling. I think you should look there for a solution and improve error handling.
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Like Stefan said, If you use Error Handler (filter option), you can handle the error and do what you want.
Take a look in below links
What service are you using to make the outbound call?