Hi, english is not my language native so apologize.
Well my problem is in this code
[ext-someextension]
exten => 124,1,SIPAddHeader(“Alert-Info:http://www.notused.com;info=alert-group;x-line-id=0”)
exten => 124,n,Dial(SIP/124&SIP/123,5)
exten => 124,n,Wait(3)
exten => 124,n,SIPAddHeader(“Alert-Info:http://www.notused.com;info=alert-external;x-line-id=1”)
exten => 124,n,Dial(SIP/124,5)
; [ext-extension]
Both phones rings well, the first phone (124) changes his ringtone by alert-group selected but then not changes to alert-external 
. What’s wrong?
greetings