How can i make video conference?

im noob in asterisk and actually im mounting a PBX…i have a VOIP of softphone and I can made calls betweens softphones but the softphones can’t show video.
the softphone that im using is x-lite.
PC1: have a webcam
pc2: doesn’t have a webcam
when i press “start” en PC1 to send video to PC2 a error message appear in the softphone that say “could not start video”

in sip.conf i wrote “videosupport=yes”. but it didn’t work :frowning:
somebody have had this problem?