> 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/bandwidth-sip-trunk.md).

# Bandwidth SIP Trunk

[Bandwidth ](https://www.bandwidth.com/)is a communications platform as a service company. It sells software application programming interfaces for voice, text messaging, and emergency services, using its own global IP voice network.

PortSIP PBX natively integrates with Bandwidth SIP trunking to support both calling and SMS/MMS messaging. Within the PortSIP PBX configuration, users can select Bandwidth as their service provider, enabling seamless use of Bandwidth’s voice and messaging services.

To successfully integrate Bandwidth with PortSIP PBX, you must complete the following high-level steps:

1. **Obtain a Bandwidth Account**\
   Create an account with Bandwidth to gain access to SIP trunking and messaging services.
2. **Log In and Configure Bandwidth Settings**\
   After account creation, sign in to your Bandwidth account and complete the required configurations for voice and SMS/MMS services.
3. **Configure Integration in PortSIP PBX**\
   Set up the Bandwidth SIP trunk and messaging integration in the PortSIP PBX Web Portal.

***

### Topics Covered in This Article

This guide includes the following sections:

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


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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/bandwidth-sip-trunk.md?ask=<question>
```

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.