Call Screening Now Give You More Control, Convenience and Privacy Take control of your incoming calls. With these four Call Screening services from Singapore Telecom:   2nd Number   Call Accept/Call Reject   Distinctive Ringing   Collect Call Screen With Call Screening services, you'll know, before answering, if a call is unwelcome and you will be able to restrict your incoming calls to specific callers. Call Screening services provide you with the ultimate in phone privacy and security.  For both your home, and your office.