asterisk users - Sep 2005 - Hangup after voicemail not detected

Hi,
    On my FC3 box I am having *v1.0.9.

The problem is that when a user calls through POTS line and leaves a
message in voicemail, the channel doesn't detect the remote hangup.

After 10 seconds of remote hangup it plays messages like vm-thankyou,
vm-review etc as if user is still online.

After that it hangs up displaying 
a warning message

"  WARNING[25623]: file.c:568 ast_readaudio_callback: Failed to write frame
"

Can it problem related to service provider...??

Had anyone solved this kind of problem earlier or if have any
idea...Please help!



My extensions.conf incoming context is 
************************************************************************
[incoming]
exten => s,1,Answer
exten => s,2,Dial(Zap/1,5,tr)
exten => s,3,Voicemail(100@default)
exten => s,4,Hangup
*************************************************************************



Gurminder