< All Topics Main Troubleshooting Check if Your Phone is Registered Print Check if Your Phone is Registered The VoIP phone “registers” with our servers on a frequent basis. This registration lets our server know where it should send inbound calls.You can tell if your phone is registered. If it is not registered, follow the Network Troubleshooting stepsYealink PhonesOn Yealink phones, the phone icon is filled wither green or grey when registered, and ic unfilled when not registeredGrandstream Phones