Can I use jigsi with Polycom hardware?

I have Polycom and Cisco hardware and I would like to know if is possible use this hardware with Jitsi and what need to do for that.

Hi, depends what you want just audio or audio and video?

Audio and video. We want to connect different offices and users by videoconference in different rooms

Then you need to deploy jibri configured as a sipgw. It is not a trivial task and one jibri instance serves one such sip audio/video session.