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).

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).

You can also configure the voltage level mode (low or high) that the FXS port generates to the connected phone for lighting the phone's lamp used for indicating a message in waiting. If you require a flashing lamp, you can configure the on-off lamp durations. To configure this feature, see the following parameters:

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EnableLowVoltageMwiGeneration

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LedMwiOnDurationTime

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LedMwiOffDurationTime

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NeonMwiOnDurationTime

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NeonMwiOffDurationTime

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

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MWIDisplay

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StutterToneDuration

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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

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ETSIVMWITypeOneStandard

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BellcoreVMWITypeOneStandard

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VoiceMailInterface

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EnableVMURI