Remember the old multi-line phones with all the buttons at the bottom? That gave him access to more than one line at a time, a feature already available in Google's Gmail.
According to the official Gmail blog, this new multi-call capability will allow you to put calls on hold with phone service Gmail, picking up another call at the same time. Too bad there's no music on hold to entertain the caller first.
They also imitate the conventional telephone call waiting, which is notified of an incoming call, and then it's up to you whether to answer or not. The only limitation of this new capability is that only allows outgoing calls to mobile two physicists at the same time.
Best of all, USAand Canada phone calls using Gmail and the video system will be free until 2011, and all these new features in several lines of work with Gmail phone calls, voice and video.