| 摘要 |
PURPOSE:To make it possible for a called subscriber to distinguish a calling from a specific extension from a calling from a general extension by using an incoming discrimination registering unit at an incoming time to an extension. CONSTITUTION:This system includes incoming discrimination registering unit CIRC and a means which registers the incoming discrimination of specific extension B to unit CIRC from extension A, and registered contents of unit CIRC are collated with incoming contents at an incoming time from specific extension B to extension A. Then, if this collation results in agreement, the call signal to extension A is distinguished from call singnals from other extensions. |
