Desktop Applications
SipTAPI
The VoIP Help Page Team·2 min read·Last updated: March 14, 2026
**Scope**:
The Windows Operating System includes TAPI as an abstraction layer that allows applications to initiate calls using a standard programming interface. It can be used by applications such as Microsoft Outlook, ConnectWise and many CRMs to initiate calls from inside the program.
Requirements:
-
Windows Computer
-
SIP Credentials
-
Access to Manager Portal
Download SIPTAPI
- 1Using any web browser, download SIPTAPI from http://sourceforge.net/projects/siptapi/files/
Installing SIPTAPI (32 bit Windows)
- 1Unzip the download and copy siptapi.tsp into c:\windows\system32
- 2Reboot your computer.
Installing SIPTAPI (64 bit Windows)
- 1Unzip the download and copy siptapi.tsp into c:\windows\system32
- 2Copy siptapi.tsp into c:\windows\syswow64
- 3Reboot your computer.
Add TAPI Provider
- 1Open Control Panel on your Computer.
- 2Click on Phone and Modem.

- 3Click on the Advanced tab

- 4Select SIPTAPI Service Provider from the list. Your specific version number may vary.
- 5If you don't see SIPTAPI on this list then click on Add
- 6Highlight SIPTAPI Service Provider and click on Add once more

- 7Click Configure.

- 8On the next screen fill out the following:
- 9SIP Domain: SIP domain
- 10SIP Outbound Proxy: sbc.ucaasnetwork.com
- 11User: SIP User
- 12Password: SIP Password
- 13User's extension (optional): The extension you would like to ring when you dial from an application. The does not have to be the same as above
- 14Click Apply.
- 15Click OK.

Removing Country Code to process calls through 10-digit Rule
It will now process calls without adding 1. This will route the call through 10 digit rule and pass the user caller ID info to the dialed number.
- 1On Outlook (if applicable), uncheck "Automatically add country/region code..".

- 2If you are using Dialer, go to Tools > Dialing properties.

- 3Edit the Default (example: my location).

- 4Configure Country to United States and area code to 1.

- 5Click Apply then OK.
Testing
You are now ready to test calling from Windows.
- 1Click Start.
- 2Type Dialer.

- 3Enter the number you want to call and click Dial.

- 4Your phone will ring. Once you answer you will be connected to the number you dialed.
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