Add Phone Numbers

Add outbound phone numbers and/or set an inbound phone number.

Inbound phone number is only supported when this capability is enabled for the client. When setting up for the first time (no existing phone masking configuration), the inbound phone number is required. For subsequent requests, the inbound phone number is optional.

Outbound phone numbers are allowed to call masked numbers to reach customers, whereas the inbound phone number receives calls from consumers.