[Freeswitch-users] Different ring_back tone if line 2 line

[Miha]

Hi,

I need a little help regarding one scenario.

A calls B, B answers a call. Then C calls B and it gets ringing, I need 
for this second calls who is waiting to have different ringback tone as 
first one how gets answer from B.

How to implelment that.

Tnx.
Miha