What is the best way to set up distinctive ringtone for internal versus external calls on the server side from the following options or is there a combination that must be configured?
1. Callflows > Action (Distinctive Ringtone) - does the SIP alert-info header string come from manufacturers docs?
2. Callflows > Devices > Options - where do you get the string for the internal and external alert-info?
3. Advanced Provisioner > Device Settings > Preferences - ringtone 1 and so on - if set up in this way, do you also need to do some configuration in the device web browser settings?
Does this only work on Yealink phones or what other brand/models is it suitable for?
Thanks for any advice