asterisk users - Jan 2008 - problem about TDM400P ringback detection

Hi to all
I'm a new user of TDM400P card. The configuration is OK and I have no
problem for incoming call. When I try to place a outgoing call towards a PSTN
number the call is not always answered. In other words TDM400P seems to not
understand that the call has been accepted from the remote party. In other cases
(different extension) the call is accepted succesfully. In my opinion TDM400P
DSP can detect if the RIngBack tone is present or not. The call is declared
answered if the ringback tone stops to occur. So my feeling is that the ringback
ton detection fails form my country (italy) in most cases even if sometime it
works fine. On Asterisk cli I can read
1) when the call is succesfully accepted

host529*CLI> 
       > Channel Zap/4-1 was answered.
       > Launching Wait(100) on Zap/4-1
host529*CLI> 

2) when the call is not succesfully accepted (after the timeout the call is
properly terminated) even if the call has been accepted by the remote party and
both the users can talk and listen each other.

host529*CLI> 
    -- Hungup 'Zap/4-1'
host529*CLI> 

Please help me to understand what I miss in the configuration. Does the TDM400P
support the italian tone sequences? I think yes.
Which parameters can I tune in order to increase the tone detection performance?

Every help will greatly appreciated.


Regards
Fabio Antonini
SW Designer, Ph.D 
Kasko Networks S.r.l. 
Piazza Regina Margherita 7, 67100 L'Aquila (ITALY) 
ph/fax: +39 862200460 mob:+39 3939261941, +39 3280451965 
email: fabio at kasko.it, fabio.antonini at kaskonetworks.it
web: http://www.kaskonetworks.it
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