asterisk users - Dec 2005 - OT Maybe: Anyone have any knowledge of v5.1/v5.2 in connection with Asterisk?

Hi All,

  I've been asked by a prospective client if Asterisk can is compliant 
with v5.1 and v5.2 - which I
never heard about till today. After trying to figure out what I'm 
dealing with, it appears as some kind
of signaling protocol, run on E1 lines.

  I was wondering if anyone has more information about this, in 
addition, if anyone knows any information
about utilizing Asterisk in such a network - if at all.

Regards,
  Nir S