Some customers are having problems with registering their VoIP phone. Investigations are underway. This will cause problems for some customers with receiving and making calls.
This is due to a problem with our storing of some of the SIP registration details, a fix is in progress.
The fix has been deployed. If you were affected by this, please re-register your VoIP phone - eg a reboot of the phone, or using its web interface to force a re-registration.
There was a problem with us storing the port for some SIP registrations between 11:14 and 12:30 which was causing some registrations to fail.