Microsip Api Documentation May 2026

If you need a real API, consider using:

The SendMessage call returns an LRESULT:

Limitation: No asynchronous callback or event notification. The calling process must poll STATUS to detect incoming calls or call termination. microsip api documentation

Once a call is active, you can send DTMF (Dual-Tone Multi-Frequency) digits.

MicroSIP.exe dtmf:12345

This sends digits 1,2,3,4,5 as RFC 2833 events. Works only during an active call. If you need a real API, consider using:

Use child_process to call a PowerShell or VBS wrapper.

| DDE Command | Parameter | Action | |-------------|-----------|--------| | Dial | number | Initiate a call. If call active, puts current on hold. | | CallTo | number | Same as Dial, but does not hold existing call. | | Hangup | (none) | Terminates active call. | | Answer | (none) | Answers incoming call. | | Reject | (none) | Rejects incoming. | | Hold | (none) | Holds/unholds current call (toggle). | | Transfer | number | Blind transfer active call to number. | | SendDTMF | digits | Sends DTMF (RFC 2833). Use , for pause. | | Mute | (none) | Toggles microphone mute. | | VolumeUp | steps | Increases speaker volume by steps (1–10). | | VolumeDown | steps | Decreases speaker volume. | | SetVolume | 0-100 | Absolute volume. | | SetMicVolume | 0-100 | Absolute mic level. | | SetDevice | input/output, deviceID | Switch audio device (see below). | | Status | (none) | Returns current call status as DDE string. | | Close | (none) | Exits MicroSIP. | Limitation: No asynchronous callback or event notification

| Command Code | String Format | Description | | :--- | :--- | :--- | | DIAL | "sip:123@domain" or "1001" | Initiates call. Returns 1 if successful, 0 if line busy or invalid. | | HANGUP | (empty) | Hangs up active call. | | ANSWER | (empty) | Answers incoming call. | | STATUS | (empty) | Returns integer: 0=idle, 1=ringing, 2=active, 3=hold, 4=disconnected. | | ACTIVECALL | (empty) | Returns remote party URI of active call. | | MUTE | "1" or "0" | Mute/unmute microphone. | | TRANSFER | "1002" or "sip:1002@pbx" | Blind transfer of active call. | | DTMF | "123#" | Sends DTMF tones over active call. | | VOLUME | "50" (0–100) | Sets speaker volume. | | QUIT | (empty) | Exits MicroSIP. |

This is the more powerful interface. Any Windows application can send a WM_COPYDATA message to MicroSIP’s main window (class "MicroSIP"). The dwData field identifies the command, and lpData contains a UTF-8 string with parameters.