Documentation - Microsip Api

MicroSIP primarily interacts with external systems through command-line arguments and event-driven execution defined in the microsip.ini configuration file.

4. Messaging (SIP MESSAGE)

  • Send and receive SIP instant messages (not SMS) – useful for internal office chat or triggering events.

Supported DDE Commands

| 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. | microsip api documentation

Part 7: Best Practices for Developers

  1. Avoid rapid sequential commands – MicroSIP processes messages asynchronously. Insert 200-500ms delays between callto and dtmf.
  2. Use report:status for state management – Never assume a call is answered; verify status before sending DTMF.
  3. Wrap API calls in a service layer – Create a local REST proxy (Node.js/Flask) to abstract the Windows API, allowing any language to control MicroSIP via HTTP.
  4. Log all API interactions – Write to a file: echo %date% %time% Dialed %number% >> microsip_api.log
  5. Gracefully handle missing instances – Before sending WM_COPYDATA, check if window exists; if not, launch MicroSIP first.

Error Handling: Since MicroSip doesn't return traditional HTTP status codes, your wrapper should check if the process is running before attempting to send commands. Conclusion Send and receive SIP instant messages (not SMS)

Make a Call:microsip.exe sip:number@domain or microsip.exe number Hang Up All Calls:microsip.exe /hangupall Answer an Incoming Call:microsip.exe /answer Minimize to Tray:microsip.exe /hide Exit Program:microsip.exe /exit 2. Windows Messaging API (For Developers) Supported DDE Commands | DDE Command | Parameter