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Voice Feature Guide 01

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Message Waiting Indication

Message Waiting Indication

This is a message prompt service, with which, the voice mail system (VMS) or unified message system (UMS) notifies users of changed number or status of messages, including emails, short messages, faxes, and leaving messages.

Message Waiting Indication

This topic describes the definition and benefits of the message waiting indication (MWI) service.

Definition

The MWI service is a message prompt service. When the status of a message (including email, SMS, fax, and voice message) on the voice mail server (VMS) changes, the MWI service sends a notification to the user, prompting the user to view the messages in a timely manner.

The MWI service permission can be configured locally or obtained through subscription. After the user has the MWI service permission, the user can turn on or off the indicator according to the instruction of the IMS. Whether the MWI has a ringing alert is controlled by the system parameter. The message MWI signal delivery can be delayed in the off-hook state.

Benefit
Beneficiary Benefits

Carrier

The MWI service enhances user experience and carriers' competitiveness.

User

With the MWI service, the user can know the change of the information stored in the VMS in time.

Standards Compliance

RFC3323

EN300 745

ETSI TS 183 006

ETSI TS 124 406

ETSI TS 300 745

ETSI TS 183 036

3GPP TS 24606

Service Flow of Message Waiting Indication

This topic describes the message waiting indication (MWI) service flow for POTS and ISDN users.

MWI Service Flow for POTS Users

Figure 1-77 shows the MWI service flow for POTS users.

Figure 1-77 MWI service flow for POTS users

User A is a service party and has subscribed to the MWI service. The MWI service flow for POTS users is as follows:
  1. When detecting that the VMS event status changes, the IMS sends a Notify message to notify AG1. If the value of Messages-Waiting field is yes, the MWI status is on. If the value is no, the MWI status is off.
  2. After receiving the Notify message, AG1 sends a signal to user A, indicating whether to turn on or off the WMI.
  3. AG1 responds with a 200 OK message.
MWI Service Flow for ISDN Users
After the MWI status of an ISDN user changes, the AG notifies the terminal of the change in either of the following modes: immediate mode and delayed mode.
  • In immediate mode, when the AG receives the MWI status change message from the IMS, the AG immediately sends a Facility message to notify the terminal.
  • In delayed mode, after receiving the MWI status change message from the IMS, the AG buffers the message until the terminal sends a Setup message, then sends a Facility message to notify the terminal of the MWI status.
The following describes the details.

MWI (immediate mode) Service Flow for ISDN Users

Figure 1-78 shows the MWI (immediate mode) service flow for ISDN users.

Figure 1-78 MWI (immediate mode) service flow for ISDN users

User A is a service party and has subscribed to the MWI service. The MWI (immediate mode) service flow for ISDN users is as follows:
  1. When detecting that the VMS event status changes, the IMS sends a Notify message to notify AG1 of the event.
  2. After receiving the Notify message, AG1 returns a Notify 200 message.
  3. AG1 sends a Facility message, in which the FIE message carries the MWI information of the user.

MWI (delayed mode) Service Flow for ISDN Users

Figure 1-79 shows the MWI (delayed mode) service flow for ISDN users.

Figure 1-79 MWI (delayed mode) service flow for ISDN users

User A is a service party and has subscribed to the MWI service. The MWI (delayed mode) service flow for ISDN users is as follows:
  1. When detecting that the VMS event status changes, the IMS sends a Notify message to notify AG1 of the event.
  2. After receiving the Notify message, AG1 returns a Notify 200 message. AG1 determines that user A has subscribed to the MWI (delayed mode) service and saves the MWI information in the buffer.
  3. User A sends a message reading request.
  4. After receiving the request from user A, AG1 sends an Invite message to the IMS.
  5. AG1 sends a Facility message, in which the FIE message carries the MWI information of the user.
NOTE:

When the service party is a POTS user, the AG delivers the MWI signal to the user. When the service user is an ISDN user, the AG sends a Q931 message to the user. The Facility IE in the Q931 message carries the MWI signal.

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Updated: 2019-02-22

Document ID: EDOC1100067358

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