AudioCodes Mediant 3000 User Manual

Version 7.0 531 Mediant 3000
User's Manual 27. Configuring Supplementary Services
27.4 Message Waiting Indication
The device supports Message Waiting Indication (MWI) according to IETF RFC 3842. The
device also supports subscribing to an MWI server (using SIP SUBSCRIBE messages).
Note: For more information on configuring IP-based voice mail, refer to the IP Voice
Mail CPE Configuration Guide.
To configure MWI, use the following parameters:

EnableMWI

MWIServerIP, or MWISubscribeIPGroupID and ProxySet

EnableMWISubscription

MWIExpirationTime

SubscribeRetryTime

SubscriptionMode

VoiceMailInterface

EnableVMURI
The device supports the following digital PSTN-based MWI features:

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:
1. The softswitch sends a SIP SUBSCRIBE message to the device.
2. 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.
3. 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.
4. The device sends another SIP NOTIFY to the softswitch, containing this MWI
information.
5. 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

AudioCodes Mediant 3000 Specifications

General

Brand	AudioCodes
Model	Mediant 3000
Category	Gateway
Language	English