# SIP Connection A robust feature within Opentact, SIP Connection allows you to meticulously define the path for your outbound call trunks. This vital configuration involves specifying an outbound SIP IP or SIP hostname. This SIP connection acts as the conduit for directing your calls, and it can be seamlessly linked to either your termination provider's SIP IP or your proprietary Class4 switch SIP IP. By leveraging SIP Connection, you gain granular control over the routing of outbound calls. Whether you choose to link it to your trusted termination provider's SIP IP or prefer the flexibility of your own Class4 switch SIP IP, Opentact empowers you to tailor the connection to suit your specific needs. This dynamic functionality ensures that your outbound calls follow the precise route you've defined, contributing to a seamless and customized communication experience. Whether you're optimizing for cost efficiency or prioritizing quality, the SIP Connection feature in Opentact provides the adaptability you need for effective call trunk management. {% hint style="info" %} All your outbound calls from Opentact will come from IP 72.21.26.46 {% endhint %} ## --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://doc.opentact.org/opentact-user-documentation/sip-connection.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.