It seems to me that you should call from the position where you are most comfortable, and best able to do the job. I don’t see why the TD should dictate where you are, since it’s not an issue of safety or technology. You might try to find out of there ‘s something else going on, like maybe it’s a lot of work for some reason to run another headset andwork light up there. If it's a logistical hassel, you could offer to help. He could just be overloaded with other work and worried about taking the time to get you setup up there, and if that’s the case maybe you could offer to relocate up there later, as long as you can get there eventually. Just be diplomatic in your approach with the TD, assure him you’re confident you can resolve problems from the booth, and you need to be there to call cues accurately.