I am currently using Polycom 335/550's. We need to force the transfer button to always and ONLY do a blind transfer. Is there a way to accomplish this? I have been searching but havne't found something 100%. If not... is there is phone I can purchase that will do this with 3CX. The owner of the company is willing to trash 40 polycom phones if another phone can do it. I would love to stay with the Polycoms, so any suggestions would be helpful. We are running 4.x firmware. Thanks!