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chan_unistim
This is a channel driver for the UNISTIM (Unified Networks IP Stimulus) protocol. It provides UNISTIM server services that you can use to drive Nortel 2002 IP phone.

The following features are supported:

    Transfer
    Threeway call
    Call Forward
    Message Waiting Indication (MWI)
    Distinctive ring
    Call History
    Send/Receive CallerID
    Redial
    (Dynamic) SoftKeys
    SendText()
    Music On Hold 

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