> 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/sinch-sip-trunk.md).

# Sinch SIP Trunk

[Sinch](https://sinch.com/voice/sip-trunking/) SIP trunking connects your phone system to the PSTN, replacing old phone lines with one easy-to-manage platform. Choose fast, self-service setup or a fully managed solution, all backed by our global Tier-1 network.

PortSIP PBX integrates with [Sinch](https://sinch.com/voice/sip-trunking/) SIP trunking 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 the Sinch Platform](/portsip-communications-solution/configuring-sip-trunks/sinch-sip-trunk/purchase-a-did-on-telnyx-platform.md)
* [Configuring Sinch IP Authentication Trunk](/portsip-communications-solution/configuring-sip-trunks/sinch-sip-trunk/configuring-sinch-ip-authentication-trunk.md)
* [Configuring Sinch Register Authentication Trunk](/portsip-communications-solution/configuring-sip-trunks/sinch-sip-trunk/configuring-sinch-register-authentication-trunk.md)
* [Configuring Outbound & Inbound Calls](/portsip-communications-solution/configuring-sip-trunks/sinch-sip-trunk/configuring-outbound-and-inbound-calls.md)
* [Sinch SMS Integration](/portsip-communications-solution/configuring-sip-trunks/sinch-sip-trunk/sinch-sms-integration.md)