From WengoWiki

Adding a Call Me button to your forum signature

To add a Call Me button to your forum signature :

• enter the following code in the signature field of your phpbb forum profile  :

[url=wengo://call/sip:nickname of your service@wdeal.com][img]http://button.wengo.com/wengo-me-little.gif[/img][/url]

• save your new profile

A "Call Me" image that can be clicked is now displayed in your forum signature when you post topics. Don't forget to specify your tariffs and opening hours in your forum signature. The Call Me image does not allow access to your service page, contrary to the Flash Call Me button that we supply in your online selfcare.