[SR-Users] Kamailio TLS with intermediate CA certificates

I found that my TLS client was not happy because my server cert is signed by an intermediate root. A quick search in Google found other people mentioning the same problem, but no solution or documentation. I've had a quick look in the Kamailio source and I notice it is using the call: SSL_CTX_use_certificate_chain_file to load the certificate specified in tls.cfg with certificate=myserver.pem In practice, this means the intermediate certificates can be appended to myserver.pem and Kamailio will present them to the TLS client: Example: Trust heirarchy: trusted root - inter 1 - inter 2 - server.example.com.pem Construct the PEM file in this exact order: cat server.example.com.pem > chain-server.example.com.pem cat inter2.pem >> chain-server.example.com.pem cat inter1.pem >> chain-server.example.com.pem and then, in tls.cfg: certificate=chain-server.example.com.pem