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ECSTA for SIP Phones

Professional TAPI driver for your SIP telephones


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Special features
Easy installation and maintenance

Easy installation and maintenance

The integrated uaCSTA server acts as registrar, provisioning server and management interface for the terminal devices and thus ensures easy initial installation and maintenance of the environment.



Independence from the platform used

Independence from the platform used

The product is completely independent of the telephone system used or the selected SIP service provider. As a result, all common Microsoft TAPI-compliant applications can also be used with SIP telephones.




  • Dial
  • Hang up
  • Answer call
  • Hold call
  • Retrieve call
  • Redirect call
  • Blind transfer
  • Setup transfer

  • Swap hold
  • Complete transfer
  • Create conference
  • Dial in dial tone mode 
  • Forwarding
  • Do Not Disturb
  • Message waiting 

Requirement for connection

SIP telephones with uaCSTA interface approved by estos.

  • Auerswald: Firmware version 2.8 A or higher
  • Mitel: Firmware version 4.1.0 Service Pack 2 or higher
  • snom: Firmware version or higher
  • Yealink: Firmware version x.81.0.15 or higher

Supported telephones

The following telephones are currently supported with the uaCSTA interface:

  • Auerswald: COMfortel 1400 IP, COMfortel 2600 IP, COMfortel 3600 IP
  • Mitel: 6863i, 6865i, 6867i, 6869i
  • snom: D3xx serie, D7xx serie, 300, 320, 360, 370, 720, 760, 820, 821, 870, D120* (For D120 no auto provisioning)
  • Yealink: T19-E2, T21-E2, T23, T27, T29, T40, T41, T42, T46, T48, T49, T52, T53, T54, T56, T57, T58, T59

System Requirements

  • Windows Server 2019
  • Windows Server 2016
  • Windows Server 2012 R2
  • Windows Server 2012
  • Windows 10
  • Windows 8.1

Collaborations and certifications