Hi Peter,

On Fri, Aug 15, 2008 at 8:53 AM, Peter Cai newptcai@gmail.com wrote:

I know H323 support conference but SIP says nothing about it. I want to make some study on this subject but there seems to be little information on Internet.

Could some one give me some clues? Is there any RFC draft on this concept?

http://tools.ietf.org/id/draft-ligot-bliss-sip-services-guide-02.txt Section 7-Conference

For further information, please follow the references (RFC 4245, 4243, 4597, 4575 aso).

Cheers,