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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 number is added to the target phone number preceded by an asterisk. Therefore, only numbers and symbols which appear on a telephone keypad will be used.
References
- 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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