What does "Prepend" do when configuring outbound calls?

The function of "Prepend" in the context of configuring outbound calls is to add digits to the beginning of the dialed number. This is crucial for scenarios where specific prefixes are needed for routing calls effectively, such as adding a dialing code for an external line or ensuring compliance with a particular number format required by an external service provider.

By adding digits at the start of the dialed number, it allows for more flexible call handling and ensures that the calls are directed correctly based on the requirements set by the organization's telephony infrastructure or regulations. For example, a business may need to prepend an area code or an access code depending on where the call is being placed.

The other options deal with characteristics of number manipulation that don't align with the "Prepend" function. Adding digits at the end or removing digits completely alters the number in ways that do not apply to the specific action of prepending. Thus, it's essential to understand that "Prepend" distinctly refers to the action of enhancing the beginning of the number dialed.