asterisk users - Apr 2005 - Problem with asterisk -> ohphone

I seem to be having problems calling ohphone from asterisk.  The audio
cuts out after a few seconds with the error from ohphone:

Incoming call from "root [192.168.0.1]" at Sat, 02 Apr 2005 22:50:55
-0500, answer call (Y/n)? Offhook - answering call
Started logical channel: sending G.711-uLaw-64k{hw} <1>
Call with "root [192.168.0.1]" established.
Accepting call.
Started logical channel: receiving G.711-uLaw-64k{hw} <6>
Onhook - ending call.
  2:17.142                 H323 Cleaner       assert.cxx(105)   PWLib  
Assertion fail: Transmit media thread did not terminate, file
channels.cxx, line 680, Error=107
 
<A>bort, <C>ore dump, <I>gnore?


Calls from ohphone to asterisk work well though.  Any ideas what is
going on?

Thanks.