> For the complete documentation index, see [llms.txt](https://support.portsip.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk.md).

# Telnyx SIP Trunk

[Telnyx ](https://telnyx.com/products/sip-trunks)allows businesses to operate a phone system over the internet instead of over physical copper lines and on-premise solutions. Telnyx customers access SIP Trunking through a user-friendly portal and flexible APIs, allowing them to stay in control and manage their global communications easily.

PortSIP PBX integrates with [Telnyx SIP Trunking](https://telnyx.com/products/sip-trunks) to support voice calls and SMS/MMS messaging, providing a simple and efficient setup experience.

This article covers the following topics:

* [Purchase a DID on Telnyx Platform](/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk/purchase-a-did-on-telnyx-platform.md)
* [Configuring Telnyx IP Authentication Trunk](/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk/configuring-telnyx-ip-authentication-trunk.md)
* [Configuring Telnyx Register AuthenticationTrunk](/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk/configuring-telnyx-register-authentication-trunk.md)
* [Configuring Outbound & Inbound Calls](/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk/configuring-outbound-and-inbound-calls.md)
* [Telnyx SMS Integration](/portsip-communications-solution/configuring-sip-trunks/telnyx-sip-trunk/telnyx-sms-integration.md)