CallControlGateway - Functions

How does the ESTOS CallControlGateway work?
ESTOS CallControlGateway serves as middleware that translates TAPI functions into SIP and uaCSTA.

With most enterprise telephony systems supporting the Microsoft TAPI standard, compatibility is virtually guaranteed. The same applies to commonly used CSTA-compliant telephony systems that do not support SIP or uaCSTA. These systems can also be integrated with the ESTOS CallControlGateway via the ESTOS ECSTA product family, a series of CSTA to TAPI bridges.

Telephony functions

  • Make Call
  • Answer Call
  • Clear Call
  • Deflect Call
  • Hold Call
  • Retrieve Call
  • Consultation Call
  • Single Step Transfer
  • Conference
  • Alternate Call
  • Generate Digits DTMF
  • Reconnect Call
  • Set Forwarding
  • Set Do Not Disturb*
  • Get Do Not Disturb Status*
  • Get Forwarding Status*
  • *wird von OCS nicht unterstützt


Server-sided Features

  • Installation with Windows Installer (MSI)
  • Central administration
  • Remote configuration & administration
  • Microsoft Active Directory Integration
  • Support for WTS / Citrix MetaFrame
  • Cluster Load Balancing compatible
  • Unanswered phone calls in absence per email


In combination with ESTOS TapiServer

  • Individuel email confirmation by unanswered phone calls in absence (per user configureable)
  • MultiSite scenario (across different locations)
  • MultiVendor scenario (different manufactures)