Editing Transport Layer Security (section)

===Other uses===
The [[Simple Mail Transfer Protocol]] (SMTP) can also be protected by TLS. These applications use [[public key certificate]]s to verify the identity of endpoints.

TLS can also be used for tunneling an entire network stack to create a [[virtual private network|VPN]], which is the case with [[OpenVPN]] and [[OpenConnect]]. Many vendors have by now married TLS's encryption and authentication capabilities with authorization. There has also been substantial development since the late 1990s in creating client technology outside of Web-browsers, in order to enable support for client/server applications. Compared to traditional [[IPsec]] VPN technologies, TLS has some inherent advantages in firewall and [[network address translation|NAT]] traversal that make it easier to administer for large remote-access populations.

TLS is also a standard method for protecting [[Session Initiation Protocol]] (SIP) application signaling. TLS can be used for providing authentication and encryption of the SIP signaling associated with [[Voice over IP|VoIP]] and other SIP-based applications.<ref>{{cite IETF|rfc=5630|title=The Use of the SIPS URI Scheme in the Session Initiation Protocol (SIP)|year=2009 |doi=10.17487/RFC5630 |last1=Audet |first1=F. }}</ref>