I'm releasing a new version of a softphone plugin for vdr (http://www.cadsoft.de/vdr). This plugin is available at http://www.ventoso.org/luca/vdr/
From the README file:
This plugin is a very simple (read: not very featureful and hopefully with an high WAF ;-) softphone using the iax protocol (asterisk server). It uses the iaxclient library (http://iaxclient.sourceforge.net) to handle every details of the call, so the plugin is just an user interface. It needs a free (i.e that isn't used by something else, like a softdevice plugin), full-duplex sound card.
There are no new features, this is a compatibility version for vdr >= 1.3.47 (including 1.4.0).
Bye