# Voxtelesys SIP Trunk [Voxtelesys ](https://voxtelesys.com/sip-trunking)offers secure, Reliable, and cost-effective SIP solutions tailored to industry needs. PortSIP PBX integrates with [Voxtelesys SIP Trunking](https://voxtelesys.com/sip-trunking) to support voice calls and SMS/MMS messaging, enabling a simple and efficient deployment for modern business communications. This article covers the following topics: * [Purchase a DID on Voxtelesys Platform](/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk/purchase-a-did-on-questblue-platform.md) * [Configuring Voxtelesys IP Authentication Trunk](/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk/configuring-questblue-ip-authentication-trunk.md) * [Configuring Voxtelesys Register Authentication Trunk](/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk/configuring-questblue-register-authentication-trunk.md) * [Configuring Outbound & Inbound Calls](/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk/configuring-outbound-and-inbound-calls.md) * [Voxtelesys SMS Integration](/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk/voxtelesys-sms-integration.md) --- # 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://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/voxtelesys-sip-trunk.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.