Manual:$wgUseTrackbacks

From MediaWiki.org

Miscellaneous settings: $wgUseTrackbacks
Introduced in version:	1.5.0 (r10252)
Removed in version:	still in use
Allowed values:	boolean
Default value:	false

Other settings: Alphabetical | By Function

[edit] Details

$wgUseTrackbacks enables blog-style trackback support if set to true in LocalSettings.php. When MediaWiki receives a trackback ping, a box will show up at the bottom of the article containing a link to the originating page. The link format can be customized by editing MediaWiki:Trackbackexcerpt.

However, MediaWiki does not support sending trackback pings.