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"True number portability and advanced call screening in a SIP-based IP ..."
Ismail Dalgic et al. (1999)
- Ismail Dalgic, Michael S. Borella, Rick Dean, Jacek Grabiec, Jerry Mahler, Guido M. Schuster, Ikhlaq Sidhu:
True number portability and advanced call screening in a SIP-based IP telephony system. IEEE Commun. Mag. 37(7): 96-101 (1999)

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