Dialled number manipulation rules pause post dial

I cannot get the w to work on a sip trunk in the dialled number manipulation rules of a trunk.

Has anyone had this working on 2.8 or know of another way to achieve a pause.

Regards

Have you upgraded all modules? If so, and the problem persists, you might have to downgrade to FreePBX version 2.7 to get this to work. See
http://www.freepbx.org/trac/ticket/4525