Until PBX systems incorporated computer technology into its call processing system design, features and functions were extremely limited. Station user features were restricted to those operations that could be handled by mechanical means. The general availability of computer SPC meant that features could be based on software programming tools, and feature development was limited only by a programmer’s imagination. Many PBX functions that are currently viewed as basic telephony capabilities, such as call forwarding and station activated conferencing, were first implemented through computer SPC. Network routing tables and CDR would not be available without computer programming capabilities.
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