You can simply type the number with the keyboard in the text input box right below the status icon and then click the green telephone icon.
The dialpad is available only when the call is active (to send DTMF or transfer).
Hope that helps.
--- On Sat, 4/30/11, Moritz Niendorf <firstname.lastname@example.org> wrote:
I would like to use Jitsi as a SIP softphone. However, I am not able to
locate any option to actually make calls by dialing a phone number.