> 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.

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