Is My Understanding Of WebRTC Protocol Correct?

This is how I understand the protocol... user on browser get media stream generates own sdp (data on codecs, security, etc) creates an offer with it send this offer to server via

Solution 1:

Client 2 generates an answer (using createAnswer), not an offer. The main difference is that an answer is a subset of the capabilities (like codecs) contained in the offer.

Otherwise this sounds good.