CHAPTER28 Configuring Supplementary Services
Mediant 800 Gateway & E-SBC | User's Manual
■ ISDN BRI: The device supports MWI for its BRI phones, using the Euro ISDN BRI variant.
When this feature is activated and a voice mail message is recorded to the mail box of a BRI
extension, the softswitch sends a notification to the device. In turn, the device notifies the BRI
extension and a red light flashes on the BRI extension’s phone. Once the voice message is
retrieved, the MWI light on the BRI phone turns off. This is configured by setting the
VoiceMailInterface parameter to 8 (“ETSI”) and enabled by the EnableMWI parameter.
■ Euro-ISDN MWI: The device supports Euro-ISDN MWI for IP-to-Tel calls. The device
interworks SIP MWI NOTIFY messages to Euro-ISDN Facility information element (IE) MWI
messages. This is configured by setting the VoiceMailInterface parameter to 8.
■ ISDN PRI NI-2: The device support the interworking of the SIP MWI NOTIFY messages to
ISDN PRI NI-2 Message Waiting Notification (MWN), sent in the ISDN Facility IE message.
This is applicable when the device is connected to a PBX through an ISDN PRI trunk
configured to NI-2. This is configured by setting the VoiceMailInterface parameter to [9].
■ QSIG MWI: The device supports the interworking of QSIG MWI to IP (in addition to
interworking of SIP MWI NOTIFY to QSIG Facility MWI messages). This provides
interworking between an ISDN PBX with voice mail capabilities and a softswitch, which
requires information on the number of messages waiting for a specific user. This support is
configured using the TrunkGroupSettings_MWIInterrogationType parameter (in the Trunk
Group Settings table), which determines the device's handling of MWI Interrogation messages.
The process for sending the MWI status upon request from a softswitch is as follows:
a. The softswitch sends a SIP SUBSCRIBE message to the device.
b. The device responds by sending an empty SIP NOTIFY to the softswitch, and then
sending an ISDN Setup message with Facility IE containing an MWI Interrogation request
to the PBX.
c. The PBX responds by sending to the device an ISDN Connect message containing
Facility IE with an MWI Interrogation result, which includes the number of voice messages
waiting for the specific user.
d. The device sends another SIP NOTIFY to the softswitch, containing this MWI information.
e. The SIP NOTIFY messages are sent to the IP Group defined by the NotificationIPGroupID
parameter.
When a change in the status occurs (e.g., a new voice message is waiting or the user has
retrieved a message from the voice mail), the PBX initiates an ISDN Setup message with
Facility IE containing an MWI Activate request, which includes the new number of voice
messages waiting for the user. The device forwards this information to the softswitch by
sending a SIP NOTIFY.
Depending on PBX support, the MWIInterrogationType parameter can be configured to handle
these MWI Interrogation messages in different ways. For example, some PBXs support only
the MWI Activate request (and not MWI Interrogation request). Some support both these
requests. Therefore, the device can be configured to disable this feature or enable it with one of
the following support:
● Responds to MWI Activate requests from the PBX by sending SIP NOTIFY MWI
messages (i.e., does not send MWI Interrogation messages).
● Send MWI Interrogation message, but don't use its result. Instead, wait for MWI Activate
requests from the PBX.
● Send MWI Interrogation message, use its result, and use the MWI Activate requests.
Caller ID
This section describes the device's Caller ID support.
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