How does Zendesk Talk handle inbound calls from callers with no caller ID?
When a call is received from a caller that is not presenting their caller ID (example: Skype or cell phones not displaying caller ID). Zendesk will automatically associate the caller to a default number "+00" within Zendesk. In addition to this default number, a user with the name "Caller Unknown" will be created and associated with the number "+00". Once the Caller Unknown profile is created, all subsequent calls recieved without an caller ID will be linked to this one Caller Unknown User.