A port number is a 16-bit unsigned integer, thus ranging from 0 to 65535.
For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port
verification'DISABLE' | 'OPTIONAL' | 'MANDATORY'
Indicates if PBX wishes (Optional) or requires (Mandatory) TLS clients to present a client certificate: