# 3CX

- [How to configure our CTS Trunk on 3CX](/support/services/voice-over-ip-voip/general/3cx-guides/how-to-configure-our-cts-trunk-on-3cx.md): This article covers how to configure 3CX using our CTS SIP Trunk service
- [Resolving Call Quality issues on 3CX deployments](/support/services/voice-over-ip-voip/general/3cx-guides/resolving-call-quality-issues-on-3cx-deployments.md): This article covers how to resolve the issue on audio in 3CX if its hosted in a Cloud Platform
- [How to configure a SIP Trunk on 3CX](/support/services/voice-over-ip-voip/general/3cx-guides/how-to-configure-a-sip-trunk-on-3cx.md): This article covers how to configure 3CX using our SIP Trunk service
- [Changes to default 3CX Headers](/support/services/voice-over-ip-voip/general/3cx-guides/changes-to-default-3cx-headers.md): This article covers modifying the 3CX headers to allow outbound calls to flow correctly through to VoIPnow.