How to read value of configuration setting from addin code (c#)

Summary

Reading value of system configuration equivalent to cfg_get('EXT_CONSOLE_WS_PORT ') in php.

Content

Hi all,

I need to read value of an Out of the box system configuration EXT_CONSOLE_WS_PORT . ROQL only returns values of custom configuration. Is there a way a global ribbon addin can read value of this configuration?

Thanks,

Bishnu