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Computer telephony integration, also called computer–telephone integration or CTI, is a common name for any technology that allows interactions on a telephone and a computer to be integrated or coordinated.

uaCSTA is a protocol that can be used for CTI.

uaCSTA standardizes a very powerful and flexible set of application services to observe and control voice and non-voice media calls as well as control and observe non-call related features.

The following uaCSTA features are supported by the N870/N670.

On / Off
External / InternalExternal: There is a separate uaCSTA server in the network. (Estos / Mondago)
Internal: The SIP platform has an integrated uaCSTA server (3CX)
AddressThe IP address / DNS name of the external uaCSTA server
PortThe port number of the external uaCSTA server


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