asterisk users - Mar 2009 - chanspy problems (asterisk 1.6.0.6) - When spying starts, the spied parties can't hear each other

Hi, I am in a predicament and any help/pointers would be appreciated.

We are using chanspy to listen in on conversations. We are doing this via a
web interface. The web interface lists all the ongoing calls. We click on a
call and then my local phone rings allowing me to spy on the session I
clicked on.

 But "most" of the time, when I start listening in, the two parties
that are
in conversation stop hearing each other. I can hear that they cant hear each
other.

We are using chanspy and passing the exact session-name to it as an
argument.

Asterisk 1.6.0.6 is being used a B2BUA. It receives calls from users
connected via analog phones to a Quintum and forwards them to a PSTNGW.

Analogphone--Quintim<------
SIP------->Asterisk<-----SIP------>PSTNGW(T1s)

All media is passing thru asterisk (canreinvite = no).


Thanks in advance for any help
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