In Califonia cause of the ST Andreys fault line where the PACIFIC PLATE and the NORTH AMERICAN PLATE slide pass each other.
Thus, my ballpark estimated cost (basically for the AT&T conference call, $50 witness fee, $150 process server's fee; $400 deposition transcript, $25 for copying costs, and about 10 hours of legal work amount to a grand estimated total of about $625 plus 10 hours of legal work.
The party noticing the deposition pays for the court reporter's fee. (The fee will include the original deposition transcript, although parties sometime stipulate that a non-noticing party will take custody of the transcript pending trial.