asterisk users - Apr 2004 - Problem with Operator Unallocated number message

We have set up an Asterisk PBX managing a EuroPRI in Italy.
We have conneccted to the asterisk PBX some Cisco IP Phones and a Panasonic
PBX with 10 analogic phones.
If we dial an unassigned  telephone number we are not able to listen to
PSTN
Operator message telling that the subscriber does not exist both on IP phones
and
analogic ones.
Asterisk simply hungs up.
We have repeated the test using a X100P  card and everything works fine.
Can someone help us?
This is the pri debug trace of the call.

-- Making new call for cr 35670
> Protocol Discriminator: Q.931 (8)  len=32
> Call Ref: len= 2 (reference 2902/0xB56) (Originator)
> Message type: SETUP (5)
> Bearer Capability (len= 3) [ Ext: 1  Q.931 Std: 0  Info transfer
capability:
Speech (0)
>                              Ext: 1  Trans mode/rate: 64kbps, circuit-mode
(16)
>                              Ext: 1  User information layer 1: A-Law (35)
> Channel ID (len= 5) [ Ext: 1  IntID: Implicit, PRI Spare: 0, Exclusive
Dchan: 0
>                        ChanSel: Reserved
>                       Ext: 1  Coding: 0   Number Specified   Channel Type:
3
>                       Ext: 1  Channel: 1 ]
> Calling Number (len= 4) [ Ext: 0  TON: Unknown Number Type (0)  NPI:
Unknown
Number Plan (0)
>                           Presentation: Unknown (67) '' ]
> Called Number (len=13) [ Ext: 1  TON: Unknown Number Type (0)  NPI: Unknown
Number Plan (0) '0816283509' ]
    -- Called g1/0816283509
< Protocol Discriminator: Q.931 (8)  len=14
< Call Ref: len= 2 (reference 35670/0x8B56) (Terminator)
< Message type: SETUP ACKNOWLEDGE (13)
< Channel ID (len= 5) [ Ext: 1  IntID: Implicit, PRI Spare: 0, Exclusive
Dchan: 0
<                        ChanSel: Reserved
<                       Ext: 1  Coding: 0   Number Specified   Channel Type:
3
<                       Ext: 1  Channel: 1 ]
< Progress Indicator (len= 2) [ Ext: 1  Coding: CCITT (ITU) standard (0)
0: 0   Location: Public network serving the local user (2)
<                               Ext: 1  Progress Description: Inband
information
or appropriate pattern now available. (8) ]
-- Processing IE 24 (Channel Identification)
-- Processing IE 30 (Progress Indicator)
< Protocol Discriminator: Q.931 (8)  len=13
< Call Ref: len= 2 (reference 35670/0x8B56) (Terminator)
< Message type: DISCONNECT (69)
< Cause (len= 2) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0: 0   Location:
Public network serving the local user (2)
<                  Ext: 1  Cause: Unallocated (unassigned) number (1), class
= Normal Event (0) ]
< Progress Indicator (len= 2) [ Ext: 1  Coding: CCITT (ITU) standard (0)
0: 0   Location: Public network serving the local user (2)
<                               Ext: 1  Progress Description: Inband
information
or appropriate pattern now available. (8) ]
-- Processing IE 8 (Cause)
-- Processing IE 30 (Progress Indicator)
    -- Channel 1, span 1 got hangup
NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Disconnect Indication, peerstate
Disconnect Request
> Protocol Discriminator: Q.931 (8)  len=9
> Call Ref: len= 2 (reference 2902/0xB56) (Originator)
> Message type: RELEASE (77)
> Cause (len= 2) [ Ext: 1  Coding: CCITT (ITU) standard (0) 0: 0   Location:
Private network serving the local user (1)
>                  Ext: 1  Cause: Normal Clearing (16), class = Normal Event
(1) ]
    -- Hungup 'Zap/1-1'
  == No one is available to answer at this time
< Protocol Discriminator: Q.931 (8)  len=5
< Call Ref: len= 2 (reference 35670/0x8B56) (Terminator)
< Message type: RELEASE COMPLETE (90)
NEW_HANGUP DEBUG: Calling q931_hangup, ourstate Null, peerstate Null
NEW_HANGUP DEBUG: Destroying the call, ourstate Null, peerstate Null
Apr 20 23:14:03 WARNING[50937879]: pbx.c:1836 ast_pbx_run: Timeout, but
no rule 't' in context 'sip'