I am using self-signed certificate for test purpose only right now. I have also contacted my IT administrator to provide CA certificate, but that might take a while when I hear back from him.
I know self-signed certificates are no good ☺, but until I hear back from him, they are only option I have got.
(This link was also quite helpful. I might give a try to OpenSSL)
https://blog.httpwatch.com/2013/12/12/five-tips-for-using-self-signed-ssl-certificates-with-ios/
I should also thank you for time and effort in helping me out. I will let you know about any progress when I get CA Certificate from my IT guys.
Regards,
Muhammad Almas