Distinctive ring with Arris MTA

I’m using models such as the Arris 502g, and would like to to setup distinctive ring over the sip connection, I have read i need to send some type of alert header. Has anyone done this, or have any suggestions, an example of my dial plan is,

exten => 111,1,Set(CALLEDNUMBER=111)
exten => 111,2,SetTransferCapability(3K1AUDIO)
exten => 111,3,Dial(SIP/111|30|jt)
exten => 111,4,Hangup()