Asterisk is easy to use. No doubt probably one of the easiest once going through the documents and understanding what the functions do. Asterisk was created for big time VoIP services providing cheap calls worldwide. Now that almost every person can own a server, it can be used as your home phone service. Wholesale VoIP termination along with Asterisk can give you extremely cheap calls within the US and especially abroad. Because of its easy to use functionally setting it up will only take a few hours. With Asterisk, a server, as DID number and some time, one can save over $1000 per year on their phone bill.
Asterisk gives freedom. If you own a business or you want phone service for your house, it can do anything. Business professionals like Asterisk because of its freedom. Majority of business make many calls daily to their customers. Regular landline services would charge extreme amounts of money to dial these calls. But with Asterisk and an Internet connection, Business can put to use Wholesale termination and save a lot of money monthly. Once Asterisk is setup, it is very easy to maintain. Any technical person can learn how Asterisk is setup in less than few hours!
Asterisk is savings. If you want to save money on your phone bill, then Asterisk is for you. Phone companies charge high prices per month because they know majority of people cannot setup an Asterisk server for themselves. Therefore, if you understand basics of programming, internet, and server management you are in good shape to use this technology. Second, this is completely free. Asterisk is open source VoIP software that is free to the general public. It cannot get better than this!
Summing this all up, Asterisk is the best. If you are looking for business solutions or residential solution or even international calling, Asterisk has a solution. It is open, it is easy, and it is a money saver. Digium has done a wonderful job creating this software and everyone should take advantage of it. Asterisk is the best open source telephone software to this day.