Twilio recently introduced a new noun that allows developers to directly dial a SIP server from their Twilio app. To test this, FreeSWITCH, a free and open-source communication server with SIP capabilities, can be used as an alternative to Twilio's built-in SIP server. Installing FreeSWITCH on a Windows or Mac machine is straightforward, while Linux users can compile the software from source or use pre-built distributions. Once installed, testing the setup involves using a SIP client like XLite to connect to the FreeSWITCH server and dial extensions. The new noun allows developers to pass data between Twilio and FreeSWITCH, such as call metadata, using custom headers and URI parameters. This enables seamless integration of Twilio with other SIP infrastructure like FreeSWITCH, making it possible to perform simple call bridging or more complex applications.