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

# How to Configure SIP Trunks

> Connect Ringingo to your voice carrier by configuring SIP trunk credentials, hosts, and codecs so calls can flow in and out.

SIP Trunks are carrier-level connections that connect the Ringingo platform to the public switched telephone network (PSTN) or a VoIP provider. Every outbound call placed from the platform must travel through an active SIP trunk.

<Steps>
  <Step title="Navigate to SIP Trunks">
    Go to **Outgoing Rules → SIP Trunks** in the left sidebar menu.
  </Step>

  <Step title="Create a new SIP Trunk">
    Click **+ Create SIP Trunk**.
  </Step>

  <Step title="Fill in the fields">
    | Field                | Description                                                                                                                                                                                       |
    | -------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
    | Name (required)      | A unique label for this trunk. Used in Outgoing Rule assignment dropdowns.                                                                                                                        |
    | Register             | Set to Yes if your carrier requires SIP registration (most hosted VoIP providers do). Set to No for IP-authentication trunks where the carrier accepts traffic from your IP without registration. |
    | Username             | The SIP authentication username provided by your carrier. Required when Register is set to Yes.                                                                                                   |
    | Password             | The SIP authentication password from your carrier. Required when Register is set to Yes.                                                                                                          |
    | Domain (required)    | The SIP server hostname or IP address of your carrier (e.g. sip.carrier.com). All outbound SIP INVITE messages are sent to this address.                                                          |
    | Outbound Proxy       | An optional secondary SIP proxy address if your carrier requires traffic routed through a proxy.                                                                                                  |
    | Status               | Enable to activate the trunk and begin SIP registration immediately. Disable to save without activating.                                                                                          |
    | Optional Information | Click the + icon to expand additional codec and advanced settings. Leave at defaults unless your carrier requires specific values.                                                                |
  </Step>

  <Step title="Save the trunk">
    Click **Save**.
  </Step>
</Steps>

<Warning>
  A SIP Trunk must be registered (Online) before it can carry live calls. If a trunk shows Offline status, check SIP credentials, network firewall rules, and carrier-side registration settings before assigning the trunk to any Outgoing Rule.
</Warning>

<Warning>
  The SIP Trunk Password is a carrier credential. Keep it confidential. If a trunk credential is compromised, immediately reset it with your carrier and update the value here to prevent toll fraud.
</Warning>