Clear telephone fixed or wireless in developing country

Our IT people have to travel to developing countries and still participate in conference calls with U.S. institutions while traveling abroad while setting up our offices. This would be before our dedicated internet and private lines are installed. The U.S. customers on the conference calls are not accustomed to such poor quality connections from land lines and cellular services: They can sound extremely muffled, distorted, can be unhearable or can't hear themselves for 30 seconds, etc. And we are not interested in making excuses to the American clients by pointing out on a big conference call that we are traveling to India and the Philippines because doing so then highlights our "abroad-ness" that we don't want to emphasize. Even high quality hotels have poor internet connections and fixed telephone in these countries. If they had good internet, I would just recommend they bring along a VoIP box and land line telephone. So here is the question:

What can the IT folks to do sound good on telephone calls when they are traveling to this undeveloped regions? Satellite phone? Take a VoIP box to a dedicated internet location that they can pay to use, but where?