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).

For FXS interfaces: The device can accept a SIP MWI NOTIFY message that indicates waiting messages or cleared messages. Users are informed of these messages by a stutter dial tone. You can define the stutter and confirmation tones in the CPT file. If the MWI display is configured, the number of waiting messages is also displayed. If the MWI lamp is configured, the phone’s lamp (on a phone that is equipped with an MWI lamp) is lit. The device can subscribe to the MWI server per port (usually used on FXS) or per device (used on FXO).

To configure MWI, use the following parameters:

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EnableMWI

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MWIServerIP, or MWISubscribeIPGroupID and ProxySet

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MWIAnalogLamp (FXS interfaces only)

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MWIDisplay (FXS interfaces only)

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StutterToneDuration (FXS interfaces only)

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EnableMWISubscription

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MWIExpirationTime

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SubscribeRetryTime

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SubscriptionMode

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CallerIDType - determines the standard for detection of MWI signals (FXS interfaces only)

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ETSIVMWITypeOneStandard (FXS interfaces only)

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BellcoreVMWITypeOneStandard (FXS interfaces only)

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VoiceMailInterface

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EnableVMURI