TLS communication is failing with SBC .
ZoiPer client is installed on Windows 10 phone. We figured out that we need to install 3rd party CA certificates on SBC and Windows phone. To generate the 3rd party CA certificate we need to provide CSR (certificate signing request). How to generate the CSR on Windows 10 phone? Once the CSR is generated we can have the 3rd party Certificate generated and installed with Zoiper Client.