Keep optional params that are config params in last step of negotiation
Keep optional params that are config params in last step of negotiation

ahmedammar/skype_farsight2,tieto/farstream,tieto/farstream,shadeslayer/farstream,pexip/farstream,kakaroto/farstream,ahmedammar/skype_farsight2,shadeslayer/farstream,kakaroto/farstream,shadeslayer/farstream,tieto/farstream,tieto/farstream,ahmedammar/skype_farsight2,pexip/farstream,ahmedammar/skype_farsight2,pexip/farstream,kakaroto/farstream,shadeslayer/farstream,kakaroto/farstream,pexip/farstream,tieto/farstream