[asterisk-users] Callgroup phone Notificacion

[voip crazy]

Hello list,

Any body knows how to indicates a ringgroup menber (extension), that
one phone of his ringgroup is ringing?

For example, in callgroup 1 there are 4 extension (10,11,12,14).
If a call comes to extension 10, how could I anounce this call to the
other extensions?
The only extension which should ring would be the extension 10, an the
other extension in the callgroup, must not ring, but have to know the
extension 10 is ringing.
I have thought about printing something in the screen of the rest of
the phones, a blinking light, or something like that.

The phones I am using are Linksys 942.

Any Clue will be welcomed.

Thanks,

VoipCrazy