asterisk users - Jun 2004 - Zapata.conf & Signaling for Bulgaria (PSTN: Siemens PABX)

Hi,

   How to configure our ZAPATA.CONF in case that the PSTN in Bulgaria
is based on Siemens equipment?
   Now my configuration is:
      [channels]
      language=en
      busydetect=no
when is "yes" I have problems with answering of FXO when FXS line is
open
      callprogress=no
when is "yes" I have problems with answering of FXO when FXS line is
open
      ; interfaces for internal analog phones
      signalling=fxo_ks
      threewaycalling=yes
      ; interfaces for external PSTN line
      signalling=fxs_ks

      
   Best Regards,
   Miroslav Nachev

   COSMOS Software Enterprises, Ltd.
   Tel:    (+359-2)   983-32-62
   Mobile: (+359-88)  897-31-95
   E-Mail: m_natchev@yahoo.com
           miro@space-comm.com
   http://www.space-comm.com

   Post address:
      P. O. Box 941,
      1000 Sofia,
      Bulgaria

   Office address:
      ap. 9, fl. 4,
      "11 August" str., No. 43,
      1202 Sofia,
      Bulgaria