Since I work for an organization with locations worldwide, teleconferences are ubiquitous for us. I prefer face to face communication but that isn't possible so I've learned to deal with teleconferences and to give trainings online.
They are certainly not without problems. During our last huge worldwide teleconference, someone put her phone on hold and the meeting had a soudtrack of the loud hold music...which was marching band music. This went on for about 5 minutes of the meeting. It was a new level of teleconference Hades.