CategoryIfAllowPings
A conditional tag that displays its contents if pings are enabled for the category in context.
On the Edit Category screen there is a checkbox for “Accept Trackbacks”
Use the mt:Pings loop to list the pings for a category.
Example
Display the count of trackbacks for the category in context and the trackback link:
<mt:CategoryIfAllowPings>
<!-- do something -->
<$mt:CategoryTrackbackCount$>
<$mt:CategoryTrackbackLink$>
</mt:CategoryIfAllowPings>