Microsip Api Documentation Jun 2026

StringBuilder sb = new StringBuilder(256); GetWindowText(hWnd, sb, sb.Capacity); return sb.ToString();

SendMessage(hWnd, WM_COMMAND, (IntPtr)0x8012, IntPtr.Zero);

Save this as dial.py (requires pywin32 ):

If you need to switch between multiple SIP providers, you can overwrite the INI file and restart MicroSIP.

MicroSIP - lightweight VoIP SIP softphone for Windows - Official Homepage

Use Linphone (has a proper REST API) or Twilio Client . But for a free, ultra-lightweight click-to-dial solution on Windows, MicroSIP’s hidden WM_COPYDATA interface is surprisingly effective.

| Command | Purpose | Data Format | | :--- | :--- | :--- | | CALL | Make a call | Phone number (string) | | SMS | Send SMS | number|message | | ANSWER | Answer incoming call | (empty or 1 ) | | REJECT | Hang up/Reject | (empty) | | DTMF | Send digits during a call | Digits (e.g., 123# ) | | STATUS | Get current call status | (empty) | | TRANSFER | Blind transfer | Destination number | | HOLD | Toggle hold | (empty) |