# CM.COM SIP Trunk

[CM.com](https://cm.com) provides a robust, carrier-grade SIP trunking solution that connects your on-premises or cloud-based PBX to the global telecommunications network. By combining high-quality voice connectivity with extensive messaging capabilities, CM.com delivers a unified platform for global calling and SMS/MMS services.

**PortSIP PBX** integrates both **calling** and **SMS/MMS** services with [CM.com](https://cm.com), allowing administrators to select CM.com as the service provider directly within the PBX configuration. This ensures seamless use of voice and messaging services from a single platform.

PortSIP PBX includes **built-in support** for [CM.com](https://cm.com) SIP trunking, making it easy to configure and deploy both voice and messaging services.

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### Prerequisites

To integrate [CM.com](https://cm.com) with PortSIP PBX, complete the following steps:

1. **Obtain a CM.com Account**\
   Create an account on the CM.com platform to access SIP trunking and messaging services.
2. **Log In and Configure CM.com Settings**\
   After account creation, sign in to your CM.com account and complete the required configuration to enable SIP trunking and messaging for use with PortSIP PBX.

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### Topics Covered in This Guide

This article includes the following configuration topics:

* [Purchase a DID on the CM.com Platform](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk/purchase-a-did-on-cm.com-platform)
* [Configure CM.com IP Authentication Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk/configuring-cm.com-ip-authentication-trunk)
* [Configure CM.com Register Authentication Trunk](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk/configuring-cm.com-register-authentication-trunk)
* [Configure Outbound and Inbound Calls](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk/configuring-outbound-and-inbound-calls)
* [CM.com SMS Integration](https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/cm.com-sip-trunk/cm.com-sms-integration)

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> **Note**\
> Supported features, authentication methods, and messaging capabilities may vary depending on your CM.com account configuration. Always follow the CM.com and PortSIP PBX configuration guidelines for best results.