Communication system selective call screening arrangement

Details Communication system selective call screening arrangement Communication system selective call screening arrangement

1979-03-26

1981-07-14

Brown, Thomas W.

179 18BE, 179 18BG, 179 84C, 179 99A, H04M 348, H04M 354

Patent

active

042788447

ABSTRACT:
A call screening arrangement is disclosed for an intercom communication system in which call features are activated by entering a two digit code from the rotary or multifrequency dial of the connected station sets. Incoming calls to a called station are screened according to the type of call features activated at the called station. The particular call screening feature activated is determined by the order of the sequential activation of the existing Call Forwarding, Callback or Do-Not-Disturb call features. The call screening features enable incoming calls controlled by either a Call Forwarding or Callback feature to selectively bypass a Do-Not-Disturb call blocking feature at the called station. When activated individually the Call Forwarding, Callback and Do-Not-Disturb features perform their individual call control routines.

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"DIMENSION Spectrum Expands with Custom Telephone Service", Horenkaup et al., Bell labs. Record, vol. 54, No. 10, Nov. 1976, pp. 274-280.

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