Administration of Message Waiting and Voice Mail

Last Updated : Feb 27, 2020 |
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Custom Local Area Signaling System (CLASS) sets are analog sets with some additional modem circuitry for enhanced signaling. This circuitry is susceptible to high voltages, up to -150 Volts, and is used by many Message Waiting line cards. Hence, for a CLASS endpoint, you must define the CLASS station with message waiting lamp as Lamp Denied (LPD) if you do not use at least one of the CLASS display features, that is, CNUA, CNUS, or CNAA.
The Lamp Allowed (LPA) feature is used for analog stations for basic message waiting lamp. Do not enable the LPA feature for analog CLASS endpoints without enabling at least one of the CLASS display features, that is, CNUA, CNUS, or CNAA, because it causes a significant health and safety hazard.
However, if you provision the CLASS set correctly with at least one of the CLASS display features, that is, CNUA, CNUS, or CNAA, the Message Waiting line cards handle the LPA feature correctly by signaling the lamp state over the modem and not by voltage.
Device Adapter supports the following:
  • Voicemail Message Waiting indication for analog sets equipped with a lamp controlled by applied voltage.
  • Voicemail Message Waiting indication for analog CLASS sets equipped with a lamp.
    Other:
    Do not use applied voltage for analog CLASS sets.
The configuration of the voice mail server is outside the scope of this document.
The following options are configured as a part of the station definition in Communication Manager, either through the Communication Manager administration screens or by using System Manager.
  • Coverage options, to route the call to the voice mail.
  • Analog station classes of service for message waiting:
    • Analog stations with a basic message waiting lamp requires the Lamp Allowed (LPA) feature.
      Note:
      For analog CLASS endpoints, if you use the LPA station definition feature, ensure that you enable at least one of the CLASS display features, that is, CNUA, CNUS, or CNAA.
    • Analog CLASS stations require the Message Waiting Allowed (MWA) feature. These will also require the following features:
      • CNUS (CLASS Calling Number Single Data String Format Allowed),
      • CNUA (CLASS Calling Number Multiple Data String Format Allowed), or
      • CNAA (CLASS Calling Name Multiple Data String Format Allowed).
        Note:
        Using the MWA feature requires at least one CLASS display feature to be used. If the CNUA, CNUS, or CNAA CLASS display feature is not assigned, the MWA feature may be non-functional.
        Other:
        For analog CLASS endpoints, if you use the LPA station definition feature, ensure that you enable at least one of the CLASS display features, that is, CNUA, CNUS, or CNAA. Using the LPA feature for an analog CLASS endpoint without using any of the CLASS display features is a health and safety hazard. Note that the endpoint does not notify the line card or server that it is an analog CLASS endpoint. This is determined during the programming.
        Therefore, using the LPA feature without using the CLASS display feature for a station which has a CLASS modem is not supported and is potentially hazardous.
  • If the LPA feature is not provided for an analog endpoint, when the Communication Manager indicates a message is waiting, Device Adapter uses the special (stuttered) dial tone.
  • Button allocation on the endpoints supports the Message Waiting lamp and button. The button has a fixed location on the UNIStim and most 39xx stations (key 5 on the 3902, and key 16 on the 3903, 3904, 3905, and other UNIStim endpoints). The 3901, 1 column and 2 column 2xxx digital stations may have the button assigned on any unassigned buttons.
These features may be configured either using the Communication Manager or using the System Manager. Refer to the Communication Manager Feature Description and Implementation document for steps involved with each aspect.