2012/1/29 Daniel Pocock daniel@pocock.com.au:
It's a little bit different in Apache, where the user specifies a file containing intermediate certs - many of the CAs give instructions for adding that file in Apache, but they make no mention of OpenSSL/Kamailio/concatenating everything, so I imagine people will get stuck on things like this
If your certificate is not signed by a root CA then you will be also provided with an intermediary certificate which is signed by a root CA, and that intermediary certificate validates yours.
So to use it, you must take your public certificate and the intermediate certificate in PEM format and concatenate both, having your public certificate at the top of the resulting file.