3.1 Trunks

Trunks

The trunks list will show you all available trunks or number ranges that are available on the customer account.

Please note that it is not possible to add a trunk as they are predefined at the time of the contract.

Under Trunks, you have the following options:

Trunk

Read-only

Trunk identification number

Can be used by end users to make outbound calls and display inbound calls to/from a non-default trunk

Please note that changing this number may affect end users. Therefore, we recommend informing end users before changing a trunk identification number.

Drop extension

Assigns a drop extension (from a drop-down menu)

We recommend configuring a drop extension for all trunks.

To understand why the drop extension is important, you need to understand what happens when an inbound call is made to a DDI that is not currently configured with a destination.

If a call is received for a DDI which is not configured as an inbound number on any target, the DFN telephone system will return a "NOT FOUND" message to the upstream carrier. In most cases, this translates to the caller getting the following message from their telephone provider: "The number you have called is not recognised. Please check the number and try again".

This often leads to unnecessary support calls, as the customer thinks that something is not working or that there is a fault in their telephone system.

This can be avoided by ensuring that all calls to all of the customer DDIs are properly routed by configuring a drop extension.

The drop extension is often the customer's main number (e.g. phone extension for reception/switchboard). It could also be configured to play an automated message (IVR), informing the caller that the number they have dialled is not currently in service.

Inbound blocklist profile

Assigns blocklist profiles (from a drop-down menu)

A blocklist profile enables the creation of rules to block incoming calls. This feature only applies to external, not internal calls.