> ## Documentation Index
> Fetch the complete documentation index at: https://docs.itellico.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# 3CX SIP Setup

> Connect a 3CX PBX or SIP trunk to itellicoAI

Use this guide if your team already manages telephony inside 3CX and you want calls to route through itellicoAI.

<Steps>
  <Step title="Configure 3CX SIP trunk">
    1. Open your 3CX Management Console
    2. Go to **SIP Trunks → Add SIP Trunk**
    3. Select **Generic SIP Trunk** as the provider
    4. Enter the itellicoAI SIP endpoint (`sip:50ebbp4vhpr.eu.sip.livekit.cloud`) as the registrar or proxy
    5. Restrict the transport protocol to **TCP**
    6. Configure authentication credentials
    7. In your 3CX firewall, allow inbound SIP traffic from the [static IP ranges itellicoAI uses](/launch/sip-trunks#static-sip-ip-ranges) (`143.223.88.0/21`, `161.115.160.0/19`)
    8. Set up inbound routing rules to forward calls to itellicoAI
  </Step>

  <Step title="Create SIP Trunk in itellicoAI">
    Go to **Telephony → SIP Trunks → Create SIP Trunk**:

    * **Name:** 3CX
    * **Termination URI:** Your 3CX SIP proxy address
    * **SIP Auth Username/Password:** Credentials configured in 3CX
    * **Allowed IPs:** Your 3CX server's public IP address
  </Step>

  <Step title="Test the connection">
    Make a test call through your 3CX system to verify calls route to itellicoAI correctly.
  </Step>
</Steps>