Linphone is an audio and video Internet phone with GTK+ and
console interfaces. It uses the SIP protocol, and is compatible
with most SIP clients and gateways. It uses various audio and
video codecs such as Speex, GSM, G711, ilbc, Theora, H263-1998,
MPEG4, and snow.

For video support you need the optional dependency ffmpeg.
To enable support for video just pass VIDEO=yes to the script.