asterisk users - Apr 2005 - LiveVoip incoming, no ringback still

I see in the list archives that this problem came up before, but there 
was no fix for it. Any clues now?

Inbound calls from LiveVoip work (I am assuming they will soon fix their 
packet loss issues at the San Diego pop) except for one thing -- no 
ringback when the called extension is ringing. My inbound context gives 
the caller a message and DISA dialtone,  DTMF digits decode OK, the 
extension rings and if the call is answered, it works. If it's not 
answered, voicemail works. But no ringback tone to the caller. Other 
incoming SIP and IAX calls get ringback. If I set DIAL_OPTIONS to m, the 
caller gets music on hold during the ring interval, but setting it back 
to r yields silence.