These all were set before but now are disabled by default because they are not proper to have enabled without a good reason.

tcp-unreg-on-socket-close

If registration is TCP or TLS and socket connection is interrupted, unregister the client.

tcp-always-nat

Treat all TCP connections as NATTED, this causes all traffic back to the phone to reuse the existing TCP socket but may
cause problems when not used with TCP keepalive.

tls-always-nat

Same as tcp-always-nat but only for TLS connections.