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

The Session Initiation Protocol (SIP) "Replaces" Header. - Rohan Mahy; Billy Biggs; Rick Dean (RFC, 2004)