asterisk users - Sep 2007 - 31 seconds because it is directly bridged to another RTP stream

Hi list,

I have a problem with 2 or 3 specific clients.

In the 6 minute, the voip client hear the other one, but the other side
can't
hear. After 30 seconds, the both sides  recover the audio.   And in the 
asterisk i have the next notice

will not be disconnected in 31 seconds because it is directly bridged to 
another RTP stream


Any comments.???? 

Regards

Guillermo Rodriguez
Songomem-Blutu