# Manage SMPP SMSC trunks

Manage existing SMPP SMSC trunks from the **SMS Trunks** page. View the
credentials that DIDWW uses to bind to your SMSC, edit a trunk's settings,
move it to another Server location, or delete trunks that are no longer
required.

## Before you begin

- An active DIDWW account is required. [Sign in to DIDWW](https://my.didww.com/users/sign_in).
- An existing SMPP SMSC trunk is required. If you do not have one, see
  [Create an SMPP SMSC trunk](create-smpp-smsc-trunk.html).

## View SMPP SMSC trunk credentials

1. In the DIDWW User Panel, go to **SMS > SMS Trunks**.
2. Locate the SMPP SMSC trunk and click the key icon in the **Credentials**
   column.

[![SMS Trunks page with the key icon in the Credentials column of an SMPP SMSC trunk highlighted](../../../../_images/credentials_button1.png)](../../../../_images/credentials_button1.png)


**Fig. 1.** Open the trunk credentials

The credentials window shows the values that DIDWW uses to bind to your SMSC.
To show the password, click the eye icon next to it.

| Field | Description |
| --- | --- |
| System ID | The System ID that DIDWW sends in the bind request. |
| Password | The password that DIDWW sends in the bind request. Hidden by default. |
| System Type | The System type that DIDWW sends in the bind request, if the trunk has one. |
| SMSC Server Host | The hostname or IP address of your SMSC that DIDWW connects to. |
| Allowed Source Addresses | The DID numbers that can be used as the sender ID. **Any** if all DIDs with outbound P2P SMS enabled are allowed. |

To change these values, edit the trunk.

[![Credentials window of an SMPP SMSC trunk showing System ID, Password, System Type, SMSC Server Host, and Allowed Source Addresses](../../../../_images/credentials1.webp)](../../../../_images/credentials1.webp)


**Fig. 2.** Review the trunk credentials

## Edit an SMPP SMSC trunk

1. In the DIDWW User Panel, go to **SMS > SMS Trunks**.
2. Locate the trunk you want to edit and click the **Actions** button next to
   it.
3. Select **Edit**.

[![Actions menu of an SMPP SMSC trunk on the SMS Trunks page with Edit highlighted](../../../../_images/actions_edit1.png)](../../../../_images/actions_edit1.png)


**Fig. 3.** Open the SMPP SMSC trunk edit form

4. On the **Edit SMPP SMSC Trunk** page, modify the settings as needed. The
   sections match those on the creation form. See [Configure the General
   settings](create-smpp-smsc-trunk.html#smpp-smsc-create-general), [Configure the source
addresses](create-smpp-smsc-trunk.html#smpp-smsc-create-source-addresses), and [Add the trunk to a trunk
   group](create-smpp-smsc-trunk.html#smpp-smsc-create-trunk-group).
5. Click **Submit** to apply your changes.

For definitions, defaults, and constraints of all settings, see [SMPP SMSC
trunk settings reference](../smpp-smsc-trunk-settings-reference.html).

[![Edit SMPP SMSC Trunk page with the General, Source Address Settings, and Trunk Group Configuration sections and the Submit button highlighted](../../../../_images/fig_edit_window3.webp)](../../../../_images/fig_edit_window3.webp)


**Fig. 4.** Update and save the SMPP SMSC trunk settings

### Move a trunk to another Server location

To change which DIDWW SMPP server connects and binds to your SMSC, change the
trunk's **Server location**. Your SMSC connection details stay the same.

Important

Before you save a new **Server location**, make sure your firewall accepts
connections from the IP address of the new location. See [Server
locations and IP addresses](../../technical-data/smpp-specification.html#smpp-endpoints).

1. In the DIDWW User Panel, go to **SMS > SMS Trunks**.
2. Locate the trunk, click the **Actions** button next to it, and select
   **Edit**.
3. Select a different **Server location**.
4. Click **Submit**.

DIDWW then binds to your SMSC from the new location. To confirm the bind, see
[Check SMPP SMSC trunk connection status](check-smpp-smsc-trunk-connection-status.html).

[![Edit SMPP SMSC Trunk page with the Server location list open and the Submit button highlighted](../../../../_images/fig_server_location.webp)](../../../../_images/fig_server_location.webp)


**Fig. 5.** Select a different Server location

## Delete SMPP SMSC trunks

Delete one SMPP SMSC trunk from its **Actions** menu, or delete multiple trunks
using **Batch Actions**.

Warning

Deleting a trunk is permanent and cannot be undone. A trunk that is
assigned to any DID number cannot be deleted until it is unassigned. See
[Assign an SMS trunk](../../../../phone-numbers/my-numbers/how-to-guides/assign-sms-trunk.html#assigning-sms-trunk).

Delete one trunk

1. In the DIDWW User Panel, go to **SMS > SMS Trunks**.
2. Locate the trunk you want to remove and click the **Actions** button
   next to it.
3. Select **Delete**.

[![Actions menu of an SMPP SMSC trunk on the SMS Trunks page with Delete highlighted](../../../../_images/actions_delete2.png)](../../../../_images/actions_delete2.png)


**Fig. 6.** Delete one SMPP SMSC trunk

4. In the **Delete SMS Trunk(s)** confirmation window, review the trunk
   and click **Delete** to permanently remove it.

[![Delete SMS Trunk(s) confirmation window for one SMPP SMSC trunk](../../../../_images/fig_delete_confirm3.webp)](../../../../_images/fig_delete_confirm3.webp)


**Fig. 7.** Confirm the deletion


Delete multiple trunks

1. In the DIDWW User Panel, go to **SMS > SMS Trunks**.
2. Select the trunks you want to delete by checking the boxes next to
   them.
3. At the bottom of the page, click **Batch Actions > Delete SMS
   Trunk(s)**.

[![Two SMPP SMSC trunks selected on the SMS Trunks page with Delete SMS Trunk(s) shown in the Batch Actions menu](../../../../_images/delete_batch_actions1.png)](../../../../_images/delete_batch_actions1.png)


**Fig. 8.** Delete multiple SMPP SMSC trunks

4. In the **Delete SMS Trunk(s)** confirmation window, review the
   selected trunks and click **Delete** to permanently remove them.

[![Delete SMS Trunk(s) confirmation window listing two SMPP SMSC trunks](../../../../_images/fig_delete_batch_confirm3.webp)](../../../../_images/fig_delete_batch_confirm3.webp)


**Fig. 9.** Confirm the batch deletion

## Related resources

- [Create an SMPP SMSC trunk](create-smpp-smsc-trunk.html) - Create and
  initially configure an SMPP SMSC trunk.
- [SMPP SMSC trunk settings reference](../smpp-smsc-trunk-settings-reference.html) - Look up field definitions,
  defaults, and constraints.
- [Check SMPP SMSC trunk connection status](check-smpp-smsc-trunk-connection-status.html) - Confirm that DIDWW is bound to
  your SMSC after you change the trunk.
- [Assign an SMS trunk](../../../../phone-numbers/my-numbers/how-to-guides/assign-sms-trunk.html#assigning-sms-trunk) - Assign or unassign an
  SMS trunk for one or more DID numbers.
- [Server locations and IP addresses](../../technical-data/smpp-specification.html#smpp-endpoints) - Look up the IP
  address of each DIDWW SMPP server location.
- [SMS trunk groups](../../trunk-groups/sms-trunk-groups.html) -
  Combine SMS trunks for failover.