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For developers looking to build on top of MicroSIP's logic, there are community-maintained projects like microsip-api on PyPI that provide Python wrappers for interacting with MicroSIP-related data or databases . MicroSIP online help microsip api better
Because MicroSIP is open source (GNU GPL), the "API" is just the standard Windows Telephony API (TAPI) and message queue. If you need a feature that doesn't exist, you can hire a C++ developer to add a new command-line switch or modify sip.dll . Example: For developers looking to build on top