If they are directly connected 'back to back' then as long as the protocol is the same there would not be much difference. However I would start with ECMAV2 if it is there, after that Cornet NQ or any other Cornet type.
Make one master and one slave regarding clocking.
Mr.SBCSU , can I have you email or Skype id.
where do you work? it seems to me you have worked to much on Siemens PABX.
anyway thank you very much for you reply.
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