When you receive an inbound call or make an outbound call, ContactWorld uses the caller's telephone number or the number that you dialed to search Desk.com for a customer record that contains the number.
If ContactWorld finds a customer record, ContactWorld pops the customer record, and creates and pops a new corresponding case record in Desk.com. ContactWorld logs the call against that record.
If no matching customer record exists, you can create a customer containing the telephone number. Any future calls made from or to that number will result in ContactWorld popping the newly created record. For information on creating a new customer record, see Creating a new Desk.com customer record.
Inbound calls from International Numbers
Desk.com cannot currently use numbers in an international format (a plus sign (+) followed by country code, region code, and extension number) in searches. For more information about international phone number format, see Telephone number formats in NewVoiceMedia in Salesforce. If an inbound call arrives from a phone number in international format, the leading plus sign is removed from the number using the number in the search.
Searches can, however, find customer records that contain phone numbers in international format in Zendesk.