Today,Asterisk become the most wide use solution for IP PBX.With Asterisk and one old PC ,you can building one system with many Application as:voicemail,Call forwarding,Music on hold,Call conferencing,v.vv.
So,you might be read this book,it;s truly useful for me when I'm development A NGN system called by Unified Messaging.I hope it can help you,too.Thank you.
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