Main portion of the advantages of the Asterisk server appears from it being an open source downloadable product. Most of the users, especially business people, can find it difficult to understand the idea behind this principle, or free software, but a business models behind open source are different and specific, as in case with Asterisk server.
unlimited local and long distance calling to anywhere in the US, Canada, China, Mexico City, and 35+ additional international destinations for one low monthly rate