1. A valid TLS certificate file for use with your SIP Server, which you can likely obtain from your IT/SIP Admin.
The file should be called/renamed sip_certs.pem
2. A TPControl SIP device.
SIP is supported in TPControl v2.6+ for Apple and TPControl v2.6+ for Android.
To add the TLS certificate for use by TPControl during TLS authentication, follow the steps below for your corresponding devices platform.
Using an Apple File Manager utility, copy the sip_certs.pem file to the existing "Apps > TPControl > Documents" directory on the TPControl for Apple device.
Using an Android File Manager utility, copy the sip_certs.pem file to the existing "./Android/data/com.touchpanelcontrol.tpcontrol/files/certs/" directory on the TPControl for Android device.