Realpresence Trio Visual+ as an autonomous video conference system

Hi to all,

I don't know if my question is a dumb question but I'm a newbe with Polycom and I'm not sure....

We have a customer who has an RealPresence Trio Visual+ equipment (they bought to other). He hasn't got any PBX system or any UC server where to register the Polycom equipment... Could the equipment works os this scenario?? I mean, could these devices work in autonomous mode??? That I need is if this equipment needs any SIP server for to work.....

Thanks in advance for all and I'm sorry if it is a very dumb question...

Regards,
David.