Is there anything special you need to do with the Sangoma phones to get the custom ringtones to work?
I’ve uploaded a custom ringtone, as an mp3, less than 15 seconds, applied it to the phone and rebooted the phone. I can confirm that it says “ring6” in the ringtone list, but it rings with ringtone 5 whenever i dial. I can’t get it to use the custom mp3.