I know I'm not supposed to even think about doing this, and support won't discuss it with me, but has anyone ever modified the default template (Yealink) so that phones will all provision with a particular feature enabled without having to go through the cumbersome process of provisioning, assigning template, and re provisioning every single phone with a custom template? I'm trying to find out: 1. Can the default template be backed up before I modify it (where are the files in the Debian file system)? 2. What happens when a template update is released? It overwrites my customization, and I have to re-apply it. But how much time do I have to do that before the updated default template starts rolling out to the phones and makes a mess?