If you have a FRITZ!Box Fon router/PBX for VoIP telephony, Dialectic can dial through it so that you can place a call over the Internet.

FRITZ!Box Dial Method Category. The group of all FRITZ!Box Dial Method configurations.
FRITZ!Box Dial Method Configurations. Configurations allow you to customize the FRITZ!Box Dial Method using different devices for different types of calls or locales.
FRITZ!Box IP. The IP address or domain of your FRITZ!Box device (e.g., 192.168.178.1 or fritz.box).
Password. The password to connect to your FRITZ!Box device.
Default Dial Port. The port to use for dialing (e.g., 1)
Prompt when Dialing. Enabling this will allow you to specify the port to use at dial time.
Connection Timeout. The duration that Dialectic should wait before giving up when contacting your FRITZ!Box device if the device is unresponsive or unavailable.
External Link. Link to external site for more information about FRITZ!Box devices.