This applies to to Polycom VVX phones:
- Navigate to 'Directory'
- Select 'Contact Directory'
- Select 'Add'
- add a name
- Select 'Add contact'
- mode -> Tel
- Telephone number must be entered exactly as the number appears when dialed in. (i.e. press star twice for '+', '15556667777')
- Select 'Auto Reject' -> Enable
- Select 'Save'