Instead of localhost you should use 0.0.0.0. That should allow clients to access.
eg like this
<from uri="jetty:http://0.0.0.0:8181/sampleHTTPInbound" />
And btw make sure you dont clash the port number with the default web console port number, which is also 8181. So you should use a different port number
<from uri="jetty:http://0.0.0.0:8182/sampleHTTPInbound" />
Thanks ! It works perfectly now...