Multiple choice technology testing

Which of these features are in-compatible?

  1. Call display & Call Waiting

  2. Call display & Call Forward

  3. Virtual Lines & MLH

  4. None of the Above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Virtual Lines and MLH (Multi-Line Hunt) are incompatible features in telecom systems because MLH requires physical line assignments while Virtual Lines abstract this concept - they cannot work together on the same service. Call Display works with both Call Waiting and Call Forward, making options A and B incorrect.

AI explanation

The marked answer, Virtual Lines & MLH (Multi-Line Hunt), reflects legacy central-office/PBX telephony feature sets, where a Multi-Line Hunt group (which routes incoming calls sequentially across a group of lines) cannot coexist with individually addressed Virtual Lines on the same line group — the hunt-group routing logic conflicts with per-line virtual addressing at the switch level. Call Display and Call Waiting are typically bundled and compatible (both are non-intrusive alert/display features layered on one line). Call Display and Call Forward are also compatible — showing caller ID doesn't interfere with forwarding logic. 'None of the above' is wrong since an incompatible pair does exist. This is vendor/switch-specific (older CO/PBX) telephony trivia, so the exact compatibility matrix ultimately depends on the specific system's documentation it was drawn from.

Keep practicing — related questions