Hello, I'm trying to get TLS cert validation between FreeSWITCH (client) and Kamailio (server) up and running. Here's my config/setup so far: FreeSWITCH 1.2.12 (client) configured with: <!-- TLS: disabled by default, set to "true" to enable --> <param name="tls" value="true"/> <!-- additional bind parameters for TLS --> <param name="tls-bind-params" value="transport=tls"/> <!-- Port to listen on for TLS requests. (5061 will be used if unspecified) --> <param name="tls-sip-port" value="5081"/> <!-- Location of the agent.pem and cafile.pem ssl certificates (needed for TLS server) --> <param name="tls-cert-dir" value="[my cert dir]"/> <!-- TLS version ("sslv23" (default), "tlsv1"). NOTE: Phones may not work with TLSv1 --> <param name="tls-version" value="tlsv1"/> <param name="tls-verify-policy" value="out"/> I have a gateway configured with ;transport=tls Kamailio 4.0 (also tried 4.1, etc) configured with (tls.cfg): [server:default] method = TLSv1 verify_certificate = no require_certificate = yes private_key = /etc/kamailio/generic-sip.key certificate = /etc/kamailio/generic-sip.pem ca_list = /etc/kamailio/generic-cacert.pem cipher_list = AES I'm using my own CA with self-signed certs. I've verified that they check out by comparing the modulus on the cert and key pairs and verifying the CA chain with 'openssl verify ...'. When I run without tls-verify-policy=none and require_certificate=no everything is golden and TLS works all day long. However, this is less than ideal and I'd like to at least make sure that my TLS clients are presenting a valid cert. Unfortunately when FS tries to connect to Kamailio it reports the following errors: ERROR: tls [tls_server.c:1190]: TLS accept:error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned ERROR: <core> [tcp_read.c:1275]: ERROR: tcp_read_req: error reading What's interesting is that FreeSWITCH reports a successful registration and seems to exchange OPTIONS pings (over UDP!) with the remote Kamailio instance. However, Kamailio does not show the endpoint as registered (verified with 'kamctl ul show'). That seems like a bug and worthy of a JIRA but my main concern at this point is getting TLS with certificate validation up and running. Any ideas? Thanks! -- Kristian Kielhofner