asterisk users - Apr 2006 - not get ring tone with chan-capi and avm b1

Hi.
First, pardon my bad English.

I have * configured with one avm b1 and latest chan-capi. I can dial out and
receive incoming calls from isdn.
The problem is that i do not know the way to get the ring tone (hear the
ringing on the caller phone when i dial with capi)

For example if i dial 0 from an ip phone and any right number i get outside
line and the destination phone is ringing, but i can not hear anything (busy
or ringing tones in the phone that makes the call). If someone answer the
call we both can speak perfectly.

I have tested several capi dial options but i can not find the doc where all
the possible parameters or options are specified.

I show you my dial string:

(first there is a menu and user dials 1 (first option) RDSI is the number of
ISDN line, and DESTINATION is a valid target number)
exten =>1,n,Dial(CAPI/g1/${RDSI}:${DESTINATION},30)

The ISDN hardware:
>capiinfo
Number of Controllers : 1
Controller 1:
Manufacturer: AVM GmbH
CAPI Version: 2.0
Manufacturer Version: 3.11-03  (49.19)
Serial Number: 4007868
BChannels: 2
Global Options: 0x00000039
   internal controller supported
   DTMF supported
   Supplementary Services supported
   channel allocation supported (leased lines)
B1 protocols support: 0x4000001f
   64 kbit/s with HDLC framing
   64 kbit/s bit-transparent operation
   V.110 asynconous operation with start/stop byte framing
   V.110 synconous operation with HDLC framing
   T.30 modem for fax group 3
B2 protocols support: 0x00000b1b
   ISO 7776 (X.75 SLP)
   Transparent
   LAPD with Q.921 for D channel X.25 (SAPI 16)
   T.30 for fax group 3
   ISO 7776 (X.75 SLP) with V.42bis compression
   V.120 asyncronous mode
   V.120 bit-transparent mode
B3 protocols support: 0x8000003f
   Transparent
   T.90NL, T.70NL, T.90
   ISO 8208 (X.25 DTE-DTE)
   X.25 DCE
   T.30 for fax group 3
   T.30 for fax group 3 with extensions

  0100
  0200
  39000000
  1f000040
  1b0b0000
  3f000080
  00000000 00000000 00000000 00000000 00000000 00000000
  01000001 00020000 00000000 00000000 00000000

Supplementary services support: 0x000003ff
   Hold / Retrieve
   Terminal Portability
   ECT
   3PTY
   Call Forwarding
   Call Deflection
   MCID
   CCBS



Can someone show me the way to solve this?
I think that i need some parameter or extra option on dial string but i did
not find the right one.

Thanks.
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