D'apres Brian A <no_spam_bca1000@hotmail.com>,
dans le forum uk.telecom.voip...
[color=blue]
> I saw this in a Voxilla thread, it may be of help as
> there is reference to the UK.
> [url]http://tinyurl.com/2xz2p8[/url][/color]

Thanks, actually while you were typing I found the answer here:
[url]http://lists.digium.com/pipermail/asterisk-users/2004-October/061995.html[/url]
and although it is said not to work, it works for me.

Disconnect Tone: 440@-30,440@30;5(.5/.5/1+2)

It seems a bit strange to enter the same frequency twice. Well, as long
as it works ;)