Could you point me to a place where you found
description of call
continuity / handover in IMS? When I did a quick search I didn't find
it.
I read mostly the article on VCC here:
http://catis-blog.com/?tag=as
Pages 236-237 of this Tekelec presentation have call flows:
http://www.iptel.org/files/sip_tutorial.pdf
S.