[Serusers] Repost: Three-way conferencing

Can someone please provide me some hints/answers to the following questions. I had posted this a few days ago and have not received any answers... 1) I realize that the SEMS has a conferencing module - But from what I understand, each user who wants to participate in a conference would be "dialing" a specific conferencing URI and they would all be bridged and conferencing can take place. Is this correct? 2) A convenient and more realistic scenario is when I am on a call with someone and I'd like to conference in someone. Normally, I would put the first user on hold, Dial a key sequence followed by the phone number of the person I'd like to conference in. Once the person picks up, I can bring the other person on-line and the conference can take place. What does one require to make this happen? From what I read, the User Agents have to support this functionality (mixing?). Can this be done via an ATA or do I need IP Phones? Which ATA/IP Phones supports this? Secondly, I assume I'd still require SEMS to act as a media server? Is this correct? Vonage supports this feature, so does this imply that the ATA that they supply provides built-in support? __________________________________ Do you Yahoo!? Meet the all-new My Yahoo! - Try it today! http://my.yahoo.com