IPsky United States
- International VoIP Wholesale Provider
- Phone To Phone
- Quintum
- Billing system of own development
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.
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