Well the question is how are you going to do conferencing with "just some IP cameras"? In its simplest form you need some type of application to do video conferencing. Smmething like Yahoo IM, AOL IM, Windows Messenger, NetMeeting, etc. These applictions tend to allow one-on one video conferncing but some are getting better. Even with apps as old as Netmeeting you could have more than 2 people on a call but you could only ever see 2 people at once at the most. Not sure about some of the new versions of IM clients though.
In general you need an MCU (Multi-point Conference Unit) in order to have true multi-party conferencing.
These units will allow everyone to see everyone else at the same time (within space constraints offered by the size of the monitor).
There are plenty of (relatively) inexpensive MCUs out there and a vast array of features. I don't think the vendor is steering you in the wrong direction. The only problem is determining if an MCU is overkill or not. Perhaps using an IM client app might be enough for your needs.
Hope this helps.
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