WolfPack Operator's Panel and ZAP

Have anybody expirience with WolfPack Operator’s Panel (http://www.wolfpackpbx.com)? SIP works fine and I like the product, but I have a problem with ZAP extension name detection. Our company use asterisk with Digium TDM400P board (please do not ask me, why so old version of asterisk - I do not know). I’m not an asterisk guru. How can I find what is the reason of the issue - the panel or asterisk?