Klipper can do a search for a highlighted phone no. in telephone books. You can highlight a phone no. in a arbitrary app e.g. on a web site.

How to do that?

Klipper offers "actions" for it.

As precondition Klipper needs to be active and must be visible as a tray icon in the panel.

Call up settings dialog and a action:

Regular expression for action:

^[\s]*[0+][\d]{2,2}[-/\d\s]{4,16}[\s]*

Now you need to add two commands for added action:

Command 1 (all on one line):

kfmclient openURL "http://www.dastelefonbuch.de/?pid=OpenSearch&cmd=search&kw=%s&le=de"

Description for command 1: Phonebook seach Konqueror

Command 2 (all on one line):

ps x|grep -q '[f]irefox' && firefox -remote openURL\("http://www.dastelefonbuch.de/?pid=OpenSearch&cmd=search&kw=%s&le=de", new-window\) || firefox "http://www.dastelefonbuch.de/?pid=OpenSearch&cmd=search&kw=%s&le=de"

Description for command 2: Phonebook seach Firefox

After that it should look like this:

After highlighting a phone no. on a web site a small window appears und you will be prompted to select an action. See screenshot at beginning of page.