I've successfully upgraded the firmware on a series of Cisco 7491G phones, provisioned them and registered them with 3CX. The arrangement works very well. I'm now trying to configure the phones for the UK. I've managed to change the voicemail prompts but, I'm struggling to configure the phones to use the UK dial tones. I think I've isolated the G3-tones.xml file as the culprit but, I cannot get hold of any code to use as a base for my UK configuration. Also, my phone fails to accept update itself with the time for the ntp server. I've run the firewall test and it all checks out. Any help with these issues would be really appreciated.