# Configure Preferred Server routing

Configure the DIDWW Points of Presence used for inbound call delivery when a
SIP trunk's **Preferred Server** is set to **Auto**.

## Before you begin

- An active DIDWW account is required. [Sign in to DIDWW](https://my.didww.com/users/sign_in).

Important

Configure your SIP endpoint and firewall to accept signaling and media
from the [DIDWW SIP signaling and RTP addresses](../sip-connectivity-reference.html#inbound-sip-connectivity-reference)
for the Points of Presence you use.
When using **Auto**, allow all DIDWW signaling and RTP addresses.

## Step 1: Open Routing Settings

1. In the DIDWW User Panel, go to **Voice > Inbound Trunks**.
2. Select the **Routing Settings** tab.

[![Inbound Trunks page with the Routing Settings tab highlighted](../../../../_images/routing-settings-tab.webp)](../../../../_images/routing-settings-tab.webp)


**Fig. 1.** Open Routing Settings

## Step 2: Configure the Points of Presence

1. On **Preferred Routing Settings**, enable or disable the available Points
   of Presence using their switches.
2. Click **Submit** to save the changes.

**US, NY** and **DE, FRA** are always enabled and cannot be disabled.

**Auto** is the default and recommended trunk setting. It allows DIDWW to
deliver calls from the Point of Presence that received them, and use an
alternative location if one becomes unavailable. To
deliver a trunk's calls through one location instead, select a specific
**Preferred Server** on a Static Endpoint trunk. See [Preferred Server
values](../sip-trunk-settings-reference.html#inbound-sip-preferred-server-values) for the available settings and
locations, and [Preferred Server routing
examples](../sip-routing-methods.html#inbound-sip-preferred-server-routing-examples) for an illustrated
comparison.

Tip

Keep all Points of Presence enabled when using **Auto**. Disabling a
location can cause unnecessary routing hops.

[![Preferred Routing Settings showing DIDWW Points of Presence switches and the Submit button](../../../../_images/preferred-routing-settings.webp)](../../../../_images/preferred-routing-settings.webp)


**Fig. 2.** Configure the Points of Presence

## Related resources

- [Preferred Server values](../sip-trunk-settings-reference.html#inbound-sip-preferred-server-values) -
  Check the available trunk settings and DIDWW locations.
- [SIP connectivity reference](../sip-connectivity-reference.html) - Find
  the signaling and RTP addresses to allow on your equipment.
- [Manage SIP trunks](manage-sip-trunks.html) - View, edit, or delete an
  existing SIP trunk, including its **Preferred Server** setting on the
  **General** tab.

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