Digium Expands Cloud Offerings by Introducing SIP Trunking for Asterisk, Switchvox, and Any IP Phone System
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Asterisk: The Definitive Guide: Open Source Telephony for the Enterprise: Van Meggelen, Jim, Bryant, Russell, Madsen, Leif: 9781492031604: Amazon.com: Books
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Asterisk For Dummies: Olejniczak, Stephen P., Kirby, Brady, Spencer, Mark: 9780470098547: Amazon.com: Books
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