Ali Jawad wrote:
ERROR:core:tls_print_errstack: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca
The server presents a certificate and the client will verify the certificate. Verification is done by the client by inspecting if the CA which signed the servers certificate is one of the local trusted (well known) CAs. (certificate authority)
Thus, you have to import the CA certificate into your SIP client.
regards klaus
(read some SSL tutorials to understand how it works)