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ITAD Subscriber Numbers, or ISNs, provide a way of interconnecting VOIP PBXs by adding a number to the internal phone number of the target phone. The ITAD[1][2] number is added to the target phone number preceded by an asterisk.[3] Therefore, only numbers and symbols which appear on a telephone keypad are used.[4]
References edit
- ^ Internet Assigned Numbers Authority, registry of "TRIP IP Telephony Administrative Domain (ITAD) Numbers"
- ^ RFC 3219
- ^ Russell Bryant; Leif Madsen; Jim Van Meggelen (10 May 2013). Asterisk: The Definitive Guide: The Future of Telephony Is Now. "O'Reilly Media, Inc.". pp. 448–. ISBN 978-1-4493-3245-7.
- ^ Teitelbaum, Ben; Todd, John (25 October 2007). Freenum/ISN Cookbook. Archived from the original on 2012-12-13.
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