[asterisk-users] Asterisk 1.8.10

[motty.cruz]

Hello, 
How to change ring tone on interncal call? I'm using Centos 5.8 Asterisk 1.8

exten =>
666,1,SIPAddHeader("Alert-Info:<http://1.2.3.4/ringtones/ghost.wav>")
exten => 666,n,Dial(SIP/10)

The above would not how to defirenciate from internal call or external call?


Thanks, 
motty