ich darf auf die zwischen Ihnen und mir geführten Telefonate beziehen.

This is out of a letter from one attorney to another which I am translating into English.

Should I even bother trying to translate "ich darf auf...beziehen", or should I just avoid it by writing "this letter is in reference to..."?

This seems to be typical "Juristendeutsch", maybe somebody out there has already given this some thought. I would be grateful for your suggestions.

Dave