Installing OpenSSL Library

If TLS support is wanted, then OpenSSL SDK must be installed in the development host.

To install OpenSSL SDK from the Win32 binary distribution:

1. Install OpenSSL SDK to any folder (e.g. C:\OpenSSL)
2. Add OpenSSL DLL location to the system PATH.
3. Add OpenSSL include path to Visual Studio includes search directory. Make sure that OpenSSL header files can be accessed from the program with #include <openssl/ssl.h> construct.
4. Add OpenSSL library path to Visual Studio library search directory. Make sure the following libraries are accessible:
   • For Debug build: libeay32MTd and ssleay32MTd.
   • For Release build: libeay32MT and ssleay32MT.

Then to enable TLS transport support in PJSIP, just add

#define PJSIP_HAS_TLS_TRANSPORT 1

in your pj/config_site.h. When this macro is defined, OpenSSL libraries will be automatically linked to the application via the #pragma construct in sip_transport_tls_ossl.c file.