[Freeswitch-users] Any Idea how to let the phone ring with a different ring tone

[Peter P GMX]

Hello,

for emergency issues I would like to let a phone ring with a different
ringer tone so that anybody can hear by the ringer tone that this call
is an alarm call.  I know that for this purpose an "Alert-Info" can be
added to the SIP header. But how has this to be invoked in FS,
especially when I want make a group call to a number of phones?
Anybody has an idea how to solve this?

Best regards
Peter