Can't get video to work w/ x-lite

i can’t get video to work between to x-lite stations.
using asterisk, x-lite 4.5.3.
both x-lites r config’d w/ only h.263+
asterisk is config’d for only h.263p in both the iax and sip settings.
i get the following message in the asterissk log:
chan_sip.c: Unsupported SDP media type in offer: video 0 RTP/AVP 98

i understand that the ‘video 0’ is problematic.

any ideas how to solve this?

solved by xlite upgrade to 4.5.5. using ms hd-3000 cams.