uaCSTA TAPI for Yealink phones

Yealink T2 series

  • Yealink T19-E2, Yealink T21-E2, Yealink T23, Yealink T27, Yealink T29
  • from firmware version x.81.0.15

Yealink T4 series

Yealink phones with firmware V81 or higher support uaCSTA, also:

Yealink VP59, Yealink SIP-T58V, Yealink SIP-T58A, Yealink SIP-T56A, Yealink T57W, Yealink T54W, Yealink T53W, Yealink T53, Yealink SIP-T54S, Yealink SIP-T52S, Yealink SIP VP-T49G, Yealink T4S, Yealink SIP-T48G, Yealink SIP-T46G, Yealink SIP-T42G, Yealink SIP-T41P, Yealink SIP-T40G, Yealink SIP-T40P, Yealink SIP-T29G, Yealink SIP-T27G, Yealink SIP-T23G, Yealink SIP-T23P, Yealink SIP-T21(P) E2, Yealink SIP1TP27TP2

Setup on the phone:

  • Open the browser interface of the phone by entering the IP- address with https: // (Example: https: //, log in and use an account that has not been used so far, in our example account 2
  • account
    • to register
    • Account2
      • Account active: Activated
      • Display name: uaCSTA
      • Registration name: MAC- Address of the phone Example : 805EC00746BF (ablesbar in the menu under Status)
      • Username: MAC- Address of the phone Example : 805EC00746BF (ablesbar in the menu under Status)
      • Password: The password ( stored in uaCSTA ( under Windows) under “CTI- Settings for Desk Phones” under “Password of the CTI- Interface” is explained further below. . Simply assign a password and remember ).
    • Under SIP-Server 1
      • Server Host: DNS-Name or IP- address of the PC and port Example : 55556
      • Transport: Protocol of the telephone interface in uaCSTA Server for SIP Phones. Example : TCP
      • Server is running from : 300
  • Leist. Charm.
    • Remote control :
    • CSTA-Control: Activated 

Settings on the PC:

Under Windows you click on the three dots : in the uaCSTA-Menu

CTI- settings for desk phones : Mac- address and IP- address of the phone can be found in the phone menu under Status

uaCSTA CTI- Settings for desk phones
Be sure to switch the top item from Cisco to Yealink, enter the IP- address of the phone, use port 55556 ( as also stored in the phone under Account ), enter the MAC- address of the Yealink phone, set a password, which you also use in the phone with uaCSTA-Konto1 Then the account should register. If not, restart the PC and the phone and make sure on the PC beforehand that the telephony service is set to “automatic”


For a first test click on :

Enter a phone number and click on the green handset . Your phone should now dial :

Test TAPI:

Start Phone.exe from Select “Global IP Tel MultiLine 000” under Device and then click on Start Session. Enter a phone number and click on “Make Call” .

If you can do that, you're done! Then you can z.B. install and enjoy CTI!