References[edit] ^ Milstead, R.M.; Warwick, P.S. (1988). "The digital PBX: current and future views of applications for information management". International Conference on Private Switching Systems and Networks, 1988. IEEE: 93–98. Retrieved 2008-05-12.  Retrieved from "" Categories: Networking hardwareSoftware architectureHidden categories: Articles needing additional references from May 2008All articles needing additional referencesAll articles with unsourced statementsArticles with unsourced statements from May 2008

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