Lei Liang wrote:
> 
> Hi, there,
>   If a client want to join a multicast conference, should it just use
> the
> multicast group address in the TO header field?

No. A multicast conference involves multicast media, but the SIP
signaling is still regular SIP. If I want to invite you to an mbone
conference, for example, the To field of my INVITE would be
sip:[EMAIL PROTECTED], as would the request URI. However, the SDP
in the INVITE would contain the multicast address of the conference.

See section 3 of:
http://www.ietf.org/internet-drafts/draft-ietf-sipping-conferencing-models-00.txt

-Jonathan R.

-- 
Jonathan D. Rosenberg, Ph.D.            72 Eagle Rock Avenue
Chief Scientist                         First Floor
dynamicsoft                             East Hanover, NJ 07936
[EMAIL PROTECTED]                 FAX: (973) 952-5050
http://www.jdrosen.net                  PH:  (973) 952-5000
http://www.dynamicsoft.com
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