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| Centrally connected 3rd party TAPI service provider (TAPI 170 telephony server)
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| Compatible to Microsoft TAPI 2.1 standard
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| Telephony features are available on every connected TAPI 170 client via TAPI 2.2 client/server architecture for Microsoft remote TSP
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| No additional TAPI client software required
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| Call signalling of incoming and outgoing calls with identification of call number
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| Additional information with redirected calls
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| Answer incoming and outgoing calls
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| Make call to external or internal parties
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| Release existing calls (drop call)
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| Initiate callback call to internal or external parties
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| Consultative call transfer
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| Consultative call transfer with dialing the extension of the destination party (one step transfer)
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| Unattendet call transfer (Blind Transfer)
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| Set /delete call forwarding
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| Add participants to conference
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| Group call signalling with group pickup
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| Unhold calls which are on hold
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| Support of code-dependent functions
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| Call data exchange between TAPI applications
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| Key access to optiPoint / OpenStage keypad
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| Control volume of Microphone
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| Control/select use of Handset/Speaker/Headset
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| Control volume of Handset/Speaker/Headset
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| Display / LED access to optiPoint / OpenStage displays (with limitation to 50 active displays per system)
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