We use VOIP for all of our calls. 

Calling is a primary means or alternatives to lower down the traveling costs and allowing workers to be more productive by not having to go out-of-office for meetings.

Calls are also beginning to cross over into the world of broadcasting and social networking, which in turn fosters new kinds of interaction patterns. Live streaming or broadcasting of conference calls allows a larger audience access to the call without dialing in to a bridge. In addition, organizers of conference calls can publish a dial-in number alongside the audio stream, creating potential for audience members to dial in if and when they wish to interact.

Telephone services are used with a landlines telephone, mobile phone, or computer, and there is no need to buy additional expensive telecommunications hardware or add/switch long distance service. Some services allow you to start a conference call or join from any country worldwide with proper telephone access.