If you have a change of behaviour, for the worse, on upgrading, you have a prima facie case for a bug report on issues.asterisk.org. As this will be a SIP issue, you will need to provide the required evidence for a SIP bug report. Check it for anything obvious, before submitting it.
I think it is in the documentation directory in the source tree, but, otherwise, it is referenced from the home page of issues.asterisk.org.
I think it is something like debug 8, verbose 8, provide both SIP history and sip set debug output. Also provide relevant parts of the dialplan and sip.conf.
1)asterisk 1.4.26.2 video call work
2)asterisk 1.6.0.15 video call doesn’t work
3)asterisk 1.6.1.6 video call doesn’t work
4)asterisk 1.6.2.0rc video call work