how to enable session-timeout with icepush?

I am using IcePush 0.2.1 with Vaadin 6.7.3 version.

I see that the session-timeout set in web.xml does not work , in-case i am using Icepush in my application.

Is there a way that the session-timeout specified in the web.xml , does not conflict with the icepush requests which are sent by the browser?